David PerlmutterPresident,, Perlmutter Health Center · Board-Certified Neurologist | Functional Medicine Pioneer | #1 New York Times Best-Selling Author | International Speaker | Host of The Empowering Neurologist Podcast

The Most Important Brain Habit

6 Apr 2026 · 1 min

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1:21

In this short health talk, board‑certified neurologist Dr. David Perlmutter emphasizes that sleep quality and quantity are among the most critical, yet under‑discussed, factors shaping brain health. He advises tracking sleep with wearable devices such as the Oura Ring or Apple Watch and targeting 7–9 hours of sleep per night, noting that both insufficient sleep and sleeping more than nine hours have been linked to higher dementia risk. Deep sleep is highlighted as essential, and wearables can help monitor it. Perlmutter references a recent study that found frequent melatonin use associated with increased heart‑failure risk, but he supports occasional melatonin use (e.g., while traveling). He then offers concrete sleep‑hygiene recommendations: turn off TVs and computers early, avoid eating after 8 p.m., consider the timing of exercise, and enforce a caffeine curfew at 2 p.m., noting personal experience of paying the price when he breaks it. The overall message is that disciplined sleep habits are vital for protecting the brain.

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This is one of the most important factors affecting your brain's destiny. Hi, I'm Dr. David Perlmutter, and I'm a board-certified neurologist. And underrepresented, underdiscussed, but really fundamentally important, and pay attention, is the quality and quantity of sleep that you're getting. Now, you want to metricize it with an Oura Ring or an Apple Watch, whatever you choose, I think it's a great idea, but you've got to get at least 7 hours, 7 to 9 hours of sleep a night. Now, too much sleep after 9 hours has been associated with increased risk of dementia, and certainly not enough sleep is associated as well. We've got to make sure that we're getting enough deep sleep, and that's why you need to metricize it with one of these handy biometrics devices. Do I like melatonin? You know, there was a study that recently came out that correlated frequent use of melatonin to increased risk of heart failure. I think these are higher levels of melatonin. I think to use it from time to time is reasonable. I certainly do, especially when I travel. But Sleep hygiene, really important. Turn the TV off, turn the computer off early on in the evening. Don't eat after 8 o'clock at night, that's way too late. And you know, you might even look at what time of day you're exercising. I have a coffee curfew, a caffeine curfew of 2 PM. I generally don't violate that. If I do violate it, I pay the price. So these things are important. Don't forget, sleep matters.