In this episode, my guest is Dr. Matt Walker, Professor of Neuroscience and Psychology and the Founder & Director of the Center for Human Sleep Science at the University of California, Berkeley. He is also the author of the international best-selling book Why We Sleep and the host of "The Matt Walker Podcast." We discuss the biology of sleep, including its various stages and what specifically happens to those stages when we don't get enough sleep. We also discuss the effects of sunlight, caffeine, alcohol, naps, hormones, exercise, marijuana, sexual activity, and various supplements on sleep. The episode consists of both basic science information and many science-supported actionable tools.    Dr. Matthew Walker: Podcast - https://www.sleepdiplomat.com/podcast  Twitter - https://twitter.com/sleepdiplomat Instagram - https://instagram.com/drmattwalker Website - https://www.sleepdiplomat.com   Thank you to our sponsors: ROKA - https://www.roka.com -- code: huberman InsideTracker - https://www.insidetracker.com/huberman Belcampo - https://www.belcampo.com/huberman -- code: huberman   Our Patreon page: https://www.patreon.com/andrewhuberman   Supplements from Thorne: http://www.thorne.com/u/huberman   Social: Instagram - https://www.instagram.com/hubermanlab Twitter - https://twitter.com/hubermanlab Facebook - https://www.facebook.com/hubermanlab Website - https://hubermanlab.com Neural Network - https://hubermanlab.com/neural-network   Timestamps: 00:00:00 Introducing Dr. Matt Walker 00:02:00 Sponsors: Roka, InsideTracker, Belcampo 00:06:00 What Is Sleep? 00:10:20 REM (Rapid Eye Movement) aka 'Paradoxical Sleep' 00:16:15 Slow Wave Sleep aka 'Deep Sleep' 00:24:00 Compensating For Lost Sleep 00:32:20 Waking in the Middle Of The Night  00:39:48 Uberman (Not Huberman!) Sleep Schedule 00:42:48 Viewing Morning SUNLight 00:49:20 Caffeine 01:07:54 Alcohol 01:14:30 Growth Hormone & Testosterone 01:16:14 Emotions, Mental Health & Longevity 01:20:40 Books vs. Podcasts 01:21:20 Lunchtime Alcohol 01:25:00 Marijuana/CBD  01:36:00 Melatonin 01:54:14 Magnesium 01:58:10 Valerian, Kiwi, Tart Cherry, Apigenin 02:15:00 Tryptophan & Serotonin 02:19:24 Naps & Non-Sleep-Deep-Rest (NSDR) 02:28:23 Is It Possible To Get Too Much Sleep? 02:34:35 Sex, Orgasm, Masturbation, Oxytocin, Relationships 02:47:30 Unconventional Yet Powerful Sleep Tips  02:59:10 Connecting to & Learning More from Dr. Walker 03:04:42 The New Dr. Matt Walker Podcast, Reviews & Support   Please note that The Huberman Lab Podcast is distinct from Dr. Huberman's teaching and research roles at Stanford University School of Medicine. The information provided in this show is not medical advice, nor should it be taken or applied as a replacement for medical advice. The Huberman Lab Podcast, its employees, guests and affiliates assume no liability for the application of the information discussed.   Title Card Photo Credit: Mike Blabac - https://www.blabacphoto.com