Hr Videos

Matthew Walker: “Why We Sleep: The New Science of Sleep and Dreams” | Talks at Google


Professor Matthew Walker, Director of UC Berkeley’s Sleep and Neuroimaging Lab discusses the latest discoveries about sleep and how it impacts our life, wellness, and lifespan.

Get the book here:


Show More

Related Articles


  1. Sometimes he calls it a lack of sleep, other times he calls it a 'disruption of sleep/wake rhythms'. I see these 2 as very different. You can go to bed and get lots of sleep, but have a different sleep schedule! All scientists do this- they don't clarify the difference in what they mean.

  2. Evolution has been disproved on so many levels that anyone professing such ridiculous notion instantly loses much of their credibility. I would urge Mr Walker to remove any references to evolution and leave it at, the brain functions as it was designed.

  3. The subject in minute 19 says that he hopes to get some of his paper done, then the presenter of this talk rephrases that to him – hoping to get all of the paper done – and calling that delusional. That is real time scientific data fraud. Why undermine good arguments which such fact bending?

  4. I love this talk, but at 25:00 he's overstating the case on the disruption due to daylight savings time. Basically, a lot of tickers out there are hanging by a thread, and losing an hour of sleep is a large enough straw to tip a failing ticker over the edge. Note the symmetry, also: an extra hour removes a straw from a camel that would have otherwise collapsed. There's very little that stops people from preparing for the spring time change a week in advance, advancing wake time 8-minutes per day, and I bet the entire morbidity bump goes away, yet few people can bother themselves to do this. If your heart isn't sturdy enough to handle this stress, it's certainly not sturdy enough to handle any other kind of major life stress, either.

  5. Melatonin is tied into thermoregulation, and a drop of body temperature can actually help to induce sleep. (I take melatonin in the afternoon to regulate my N24 sleep disorder, and I do have to watch my body temperature thereafter in order to remain fully alert until my proper bedtime.) People who take melatonin regularly at bedtime typically only get a few extra minutes. It's a trivial effect on sleep duration, at best.

  6. A good rule of thumb with caffeine is to regulate your intake until you can skip an entire day without feeling crappy. On a regular dose of 28 g of beans per day (16 oz of brewed coffee), if I skipped my morning coffee, I felt like absolute crap by noon. On a regular dose of 14 g of beans per day (8 oz of brewed coffee, all before noon) I can skip my morning coffee the next day and only feel mildly crappy by late afternoon. Still not good enough, so I'm cutting my caffeine down again. I've read research in the past that somewhere between 10–14 g per day is physiologically optimal, as a stimulant (beyond that level, the extra stimulation is cancelled out by a flattening of cognitive affect: more racing thoughts, ever shallower).

    Pro tip: I always brew exact doses, measured on a gram scale, one tiny cup at a time. An open pot would have me back to my historic abuse levels within two months. I can never say no to another sip of hot coffee already brewed. Especially back when I was self-medicating my sleep disorder with the wrong drug.

  7. To deal with the blue light problem, I installed red shift software in my computer, and I try to get away from my desk in the late evening. What I usually end up doing is reading (actual books) in bed, under a yellow bug light. The version I have is a 14 W CFL encased in a yellow plastic shroud (filter design). In this bulb, the CFL comes on very dim and takes about a minute to brighten up. Not why I bought it, but it turns out to be perfect for groping around in the middle of the night on my bedside table for a few seconds without giving my eyes a bright, alerting surprise. I actually read most of my books with a voice-activated recorder running, in case I want to make any immediate notes or comments, which makes me less annoyed about not being handy to a keyboard (laggardly pens are for diagrams or list items, not sentences). I halfway suspect my N24 is due to my having an extremely blunted circadian response to blue light, but I figure it can't hurt, regardless.

  8. The kinds of sleep masks one tends to find in drugstores or superstores are okay for sleeping in low light, but for actually sleeping during the day (when my N24 treatment fails and I need to reset) I always wear two. The elastics fatigue within a month or two, so a proper cinch mechanism to take up the slack is a godsend. Some of them have a stupid little plastic clip with pointy teeth that never manages to hold for long. Consign these to the trash bin. Knots work in a pinch, but can leave sleep divots in your head if you're not careful. I rate my sleep mask fairly high in my sleep-quality arsenal.

  9. During day light saving, the increase in heart attacks can be explained by more people being stressed, like missing a plane for example, due to the fact that they forgot to adjust their clocks…where exactly is the proof that heart attacks increase because people slept 1 hour less rather than because their schedule is messed up and they hurry and get stressed but to be late? There could be other explanations I believe…

  10. We upload our days experiences to the cloud… we are universal star recorders… made of star stuff right? a way for the universe to realize itself? As Carl Sagan said.. well, I think when we sleep our universal conciousness some how transmits out days events to the giant osmicognic universal disputant who takes all data from all creatures that sleep and all that experience some how is fed back into the hive-mind of the pan-conciousness whatever oh I dunno… we're like little experience nodes… we're not really in control of ourselves… anyway, sweet dreams

  11. Why is that people like Donald Trump who self proclaims only 4 – 5 hours of sleep per night is one of the sharpest, most powerful men in the world right now with zero health issues?

  12. He's not a good speaker. He talks too slowly and dumbs down long established science for dimwits. What kind of idiots do Google hire if they didn't know 80% of this already?

Leave a Reply

Your email address will not be published. Required fields are marked *

Back to top button