GUEST SERIES | Dr. Matt Walker: The Science of Dreams, Nightmares & Lucid Dreaming
Dr. Matthew Walker, Ph.D., discusses dreaming, its biological mechanisms, and functions like creativity and emotional regulation. He covers dream interpretation, nightmares and their therapies, lucid dreaming, and answers audience questions on topics including rumination, sleep positions, mid-night waking, aging, menopause, and supplements.
Deep Dive Analysis
18 Topic Outline
Defining Dreams and Their Peculiarities
REM Sleep Across Species and Brain Activity During Dreams
Sleepwalking, Sleep Talking, and Brain Imaging of Dream Content
Functions of Dreaming: Creativity and Emotional Regulation
Dream Content: Daily Experiences, Emotions, and Abstractions
Dream Interpretation: Freud's Theory vs. Personal Deconstruction
Nightmares: Definition, Therapy, and Fear Extinction
Lucid Dreaming: Scientific Validation, Benefits, and Drawbacks
Methods to Induce Lucid Dreaming
Audience Q&A: Managing Rumination Before Sleep
Audience Q&A: Best Sleep Position and Snoring Solutions
Audience Q&A: Waking Up at Consistent Times
Audience Q&A: Sleep Banking and Catching Up on Sleep
Audience Q&A: Sleep Challenges in Older Adults
Audience Q&A: Menopause and Sleep Disruption
Audience Q&A: Dream Recall and Sleep Quality
Audience Q&A: Key Supplements for Sleep
Audience Q&A: The Most Important Tip for Better Sleep
8 Key Concepts
Dream (scientific definition)
In sleep science, a dream is loosely defined as any report of mental activity upon awakening. This broad definition captures any thought or sensation recalled from sleep.
Dream (common definition)
What most people refer to as a dream are the bizarre, hallucinogenic, vivid, narrative, and emotion-filled story experiences that primarily occur during Rapid Eye Movement (REM) sleep. These are the classic 'strange dreams' people often recall.
Parasomnias
These are abnormal behaviors that occur around sleep, such as sleepwalking, sleep talking, or sleep eating. They happen when an individual is launched from deep non-REM sleep towards wakefulness but doesn't fully reach it, and are not associated with dreaming.
Memory Reconsolidation
This is the process by which a consolidated memory, when reactivated or recollected, becomes plastic and malleable again. This allows for updating or revising the information within that memory store before it is re-consolidated during subsequent sleep.
Targeted Memory Reactivation (TMR)
A research tool where specific memories learned during the day are 'tagged' with a congruent sensory cue, like a sound or odor. Replaying this cue during sleep, at a sub-awakening threshold, can selectively strengthen the consolidation of those tagged memories.
Fear Extinction (in sleep)
This refers to the brain's ability, particularly during sleep, to decondition or extinguish fear memories. Sleep-dependent memory processing can be harnessed to not only strengthen desired memories but also to reduce the emotional impact of distressing ones.
Lucid Dreaming
Lucid dreaming is the state of knowing that one is dreaming while the dream is still unfolding. In its more advanced form, it involves taking conscious control over the dream's narrative and actions.
Fuzzy Logic (in dreams)
During REM sleep, the brain's neurochemistry (low noradrenaline, high acetylcholine) modulates neural circuits to inject more 'noise' relative to the signal. This results in less obvious, more distant, and bizarre associations, akin to a broad, non-linear search engine for ideas.
15 Questions Answered
Dreaming most frequently occurs during REM sleep, with an 80-90% probability of reporting a dream when awakened from this stage, especially during phasic REM sleep when eye movements are present.
Dreaming serves two main functions: enhancing creativity by associating memories to solve problems, and providing emotional regulation, acting as a form of overnight therapy to process difficult experiences.
While Freud's specific 'disguised censorship' theory is not scientifically testable or reliable, reflecting on dreams can be beneficial as they offer a window into important waking life concerns. The individual is often the best interpreter of their own dreams.
Nightmares are strongly unpleasant dreams causing daytime distress, often recurring at least once a week. Image Rehearsal Therapy (IRT), which involves rehearsing an alternate, neutral ending to the nightmare, is an effective treatment.
Lucid dreaming is the state of knowing that one is dreaming while still in the dream state, often allowing for conscious control of the dream. While its benefits are debated, some studies suggest it might be associated with less restorative sleep due to increased brain activity.
To short-circuit rumination, engage in activities that divert the mind, such as meditation, breathing techniques, listening to sleep stories, body scans, or vividly imagining a familiar mental walk.
Sleeping on your back is generally ill-advised, especially for snorers, as it increases the likelihood of snoring and airway collapse. Side or front sleeping is preferred, and using an app like Snore Lab can help identify snoring issues that warrant a doctor's visit.
Consistent waking times can be due to reliably timed sleep cycles, as people often briefly wake after REM sleep. However, if one checks the clock, it can reinforce a learned association, teaching the brain to wake at that specific time, so removing clocks from sight is recommended.
You cannot retroactively 'bank' sleep; if you miss sleep, you cannot fully recover the lost benefits later. However, you can pre-emptively 'bank' sleep by sleeping longer before an anticipated period of sleep deprivation, which can lessen the impact of the upcoming debt.
Avoid trying too hard to fall back asleep, as frustration is counterproductive. Instead, embrace the concept of 'rest' without the pressure to sleep, simply lying in bed and enjoying the rest, trusting that sleep will return when the mind relaxes.
First, assess how one feels on six hours of sleep. If impaired, try to delay bedtime to build sleep pressure, gradually shifting the sleep schedule later. Cognitive Behavioral Therapy for Insomnia (CBTI) and certain medications like Doxepin or DORAs can also be discussed with a physician.
One non-medication method is using smart cooling mattresses to counteract hot flashes. Bioidentical hormone replacement therapy can also be effective by bringing sex hormone changes under control, which helps alleviate sleep-disrupting symptoms, though this is a personal choice to discuss with a doctor.
No, there is no strong correlation between remembering or not remembering dreams and the amount of REM sleep obtained or the overall quality of sleep. Dreams, even if forgotten, may still implicitly influence behavior.
Recommended supplements include magnesium threonate (or bisglycinate), apigenin (a derivative of chamomile), and theanine (though it can cause vivid dreams for some). Glycine (1.5-2g) and phosphatidylserine (to tamp down cortisol) also show promise, but foundational behavioral changes are paramount.
Regularity is the most important tip. Maintaining a consistent sleep schedule, including on weekends, and aligning sleep timing with one's chronotype, will significantly improve sleep.
29 Actionable Insights
1. Prioritize Sleep Regularity
The single most important tip for better sleep is regularity; maintain a consistent sleep schedule, including on weekends, as this foundational practice allows many other aspects of sleep to naturally improve.
2. Synchronize Sleep with Chronotype
Align your sleep timing with your natural chronotype (whether you’re a morning lark or night owl) and maintain regularity on weekdays and weekends to significantly improve sleep quality.
3. Short-Circuit Pre-Sleep Rumination
To manage rumination and negative thoughts before sleep, engage in activities that get your mind off itself, such as meditation, breathing techniques, listening to sleep stories, body scans, or taking a detailed mental walk.
4. Embrace Rest, Don’t Force Sleep
If you wake up in the middle of the night and struggle to fall back asleep, stop trying too hard; instead, embrace the concept of rest by simply lying in bed and enjoying the quiet, which can often lead to sleep returning naturally.
5. Avoid Accumulating Sleep Debt
Understand that you cannot truly pay back sleep debt retroactively; if you miss sleep, you lose the chance for certain benefits like memory consolidation, and chronic short sleep accumulates like compounding interest on your health.
6. Pre-Emptively Bank Sleep
If you anticipate periods of sleep loss (e.g., night shifts), try to sleep longer in the days prior to build up “sleep credit,” which can lessen the negative impact of the subsequent sleep debt.
7. Check for Snoring with SnoreLab
Download the SnoreLab app to record and assess your breathing during sleep; if it confirms snoring, especially moderate to epic, consult your doctor as it may indicate undiagnosed sleep apnea.
8. Avoid Back Sleeping if Snoring
Avoid sleeping on your back, especially if you snore, as it significantly increases the likelihood of snoring, airway collapse, and hypoxic events; side or front sleeping is generally preferred.
9. Reduce Alcohol to Lessen Snoring
Be aware that alcohol intake can significantly increase snoring, so reducing or avoiding alcohol, especially before bed, may help mitigate snoring.
10. Remove Clocks from Bedroom
If you consistently wake up at the same time, remove all clock faces from your sight in the bedroom to prevent reinforcing the habit and teaching your brain to wake at that specific time.
11. Dream for Creative Solutions
To gain creative insights and solutions, ensure you are not only sleeping and dreaming, but specifically dreaming about the problems or challenges you are trying to solve in your waking life.
12. Dream for Emotional Resolution
To achieve emotional resolution and mental wellness, allow yourself to dream about specific difficult or problematic emotional experiences, as this process can act as a form of overnight therapy.
13. Self-Interpret Your Dreams
Engage in journaling, deliberation, or cogitation of your dreams, as they offer a window into essential waking life concerns and can provide personal insight, though a therapist can also guide this.
14. Practice Image Rehearsal Therapy
To treat recurring nightmares, work with a therapist to describe your nightmare, write down its narrative, and then collaboratively create and rehearse a more neutral or positive alternate ending.
15. Enhance IRT with TMR
To significantly improve Image Rehearsal Therapy for nightmares, pair the rehearsal of the alternate ending with a specific sound (e.g., a pleasant piano chord) and then replay that sound at a sub-awakening threshold during REM sleep.
16. Extinguish Fear Memories During Sleep
To extinguish fear memories, initiate a deconditioning protocol during wakefulness and then continue it during sleep, as sleep can be as or more effective than wakefulness for this process.
17. Remember Dreams by Staying Still
To remember your dreams, remain still with your eyes closed upon waking and mentally rehearse the dream repeatedly before moving or opening your eyes, to help solidify the memory.
18. Disrupt Nightmares by Moving
If you wake up from a nightmare feeling anxious or disturbed, get up and move your body, and consider turning on some lights, to help shake off the negative affect and fall back asleep.
19. Adjust Bedtime for Early Waking
If you’re an older adult consistently waking up too early and unable to fall back asleep, try delaying your bedtime by an hour or more to build up sleep pressure, which can help you sleep longer into the morning.
20. Consider CBTI for Older Adults
Older adults struggling with sleep should consider Cognitive Behavioral Therapy for Insomnia (CBTI) with a board-certified sleep medicine clinician, as it is an effective treatment to help stay asleep.
21. Discuss Sleep Medications with Doctor
Older adults experiencing sleep issues can discuss medications like low-dose Doxepin (3-6mg) or DORAs (dual orexin receptor antagonists) with their physician, as these have shown promise for maintaining sleep.
22. Use Cooling Mattress for Menopause
For menopausal women experiencing hot flashes (vasomotor symptoms) that disrupt sleep, consider using a cooling mattress to help regulate body temperature and improve sleep quality.
23. Consider BHRT for Menopause Sleep
Women experiencing sleep disruption due to menopause may consider discussing bioidentical hormone replacement therapy (BHRT) with their doctor, as it can help control symptoms and normalize reproductive hormones that promote sleep.
24. Practice MILD for Lucid Dreaming
To induce lucid dreaming, consistently rehearse before bed the intention to remember your dreams and instigate control within them.
25. Practice Reality Testing for Dreams
To induce lucid dreaming, regularly perform reality checks during the day (e.g., flipping a light switch, pushing hand into a solid object) so that you eventually do it in a dream, recognizing the illogical outcome as a cue for lucidity.
26. Consult Doctor & Prioritize Behavior
Before taking any supplements for sleep, always consult your doctor and ensure you are first diligently practicing all recommended behavioral sleep hygiene protocols, as these are far more impactful.
27. Consider Specific Sleep Supplements
After optimizing sleep behaviors and consulting a doctor, consider supplements like magnesium threonate/bisglycinate, apigenin, theanine (with caution for vivid dreams), inositol (900mg), glycine (1.5-2g), or phosphatidylserine to support sleep.
28. Engage in Regular Therapy
Consider doing regular therapy with a quality therapist, as it is one of the best things for mental health and can be as beneficial as regular physical exercise.
29. Claim Free Element Sample Pack
To try Element, visit drinkelement.com/Huberman to claim a free sample pack with your purchase.
8 Key Quotes
Well, last night, both you and I and everyone listening, as long as they slept, we all became flagrantly psychotic.
Dr. Matthew Walker
If you were to experience any one of those five symptoms while you're awake, we'd probably be seeking psychological or psychiatric treatment. But for reasons that we still don't fully understand, that seems to be a normal biological and psychological, and in fact, and I'll describe the data, absolutely necessary life support, perhaps necessary set of experiences to go through.
Dr. Matthew Walker
If that's not a perfect neural definition of this thing called dreaming, I don't know what is.
Dr. Matthew Walker
a life unexamined is not a life well lived. And that isn't just applicable to your waking life. It's especially applicable to your dreaming life.
Dr. Matthew Walker
I think the very best person to interpret your dreams is probably you.
Dr. Matthew Walker
nightmares suck.
Andrew Huberman
sleep is of the brain, by the brain, and for the brain.
Dr. Matthew Walker
Regularity. Just keep things regular. If you get regular sleep, a lot of things will start to take care of themselves.
Dr. Matthew Walker
8 Protocols
Image Rehearsal Therapy (IRT) for Recurring Nightmares
Dr. Matthew Walker- Sit with a therapist and describe the recurring nightmare, writing down its narrative.
- Work with the therapist to agree upon a more neutral ending to that nightmare.
- Consistently rehearse this alternate, positive ending during your waking day.
- Over time, this process helps to update the memory of the trauma, reducing the frequency and intensity of the nightmare.
IRT with Targeted Memory Reactivation (TMR) for Nightmares
Dr. Matthew Walker- Follow the Image Rehearsal Therapy steps, rehearsing the alternate nightmare ending.
- During the daytime rehearsal, play a specific, pleasant piano chord (or other congruent sound) every 10 seconds, bonding it with the new, positive ending.
- At night, once in REM sleep, replay that same piano chord over and over again at a sub-awakening threshold.
- This combined approach significantly enhances the effectiveness of nightmare reduction, driving success rates from 66% to 92%.
Method for Remembering Dreams
Rick Rubin (as taught to Andrew Huberman), Dr. Matthew Walker- Upon waking from a dream, lie completely still with your eyes closed.
- Gradually rehearse that dream over and over in your mind, almost as though you're etching it into your memory, piecing back the jigsaw puzzle.
- Once you've recapitulated and recalled the dream, then gradually open your eyes and dictate or write down the details.
Mnemonic Induction of Lucid Dreaming (MILD) Technique
Dr. Matthew Walker- Consistently rehearse before bed the notion that 'I will remember my dreams and I will instigate control in my dreams.'
- Repeat this practice over and over again, as it increases the probability of lucid dreaming.
Reality Testing Method for Lucid Dreaming
Dr. Matthew Walker- During your waking day, set reminders (e.g., an alarm) to constantly perform a reality test, such as flipping a light switch on and off or pressing your hand into a solid object.
- Observe that in the real world, the lights comply, or the object resists your hand.
- Through consistent practice, this behavior becomes routine and may transfer into your dreams.
- In a dream, if the lights don't respond or your hand passes through an object, this serves as a cue that you are dreaming, leading to lucidity.
Managing Negative Rumination When Trying to Fall Asleep
Dr. Matthew Walker- Engage in meditation, either guided or self-directed, focusing on breathing or relaxation.
- Practice specific breathing techniques.
- Listen to sleep stories to distract your mind.
- Perform a body scan, focusing on sensations throughout your body.
- Take a detailed mental walk through a route you know intensely well, replicating it with vivid 4K detail to fully engage your mind.
Getting Back to Sleep After Waking Up Mid-Night
Dr. Matthew Walker- Avoid trying too hard to fall back asleep, as frustration is counterproductive and pushes sleep further away.
- If active techniques (like mental walks) are not working, change your approach to simply 'resting' in bed.
- Tell yourself that it's okay if you don't fall asleep, and just enjoy a good, stress-free rest in your bed.
- Often, as soon as the pressure to sleep is removed and you relax, sleep will return naturally.
Addressing Early Waking in Older Adults
Dr. Matthew Walker- First, assess how you feel on the current amount of sleep; if you feel impaired during the day, consider intervention.
- Try to delay your bedtime as much as possible, pushing it later to build sufficient sleep pressure.
- Maintain this later bedtime consistently over several days to gradually shift your body's sleep schedule.
- Consider Cognitive Behavioral Therapy for Insomnia (CBTI) or discuss sleep medications like Doxepin (3-6mg) or DORAs with a board-certified sleep medicine clinician.