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

Your Brain Cannot Afford Bad Sleep | Dr. David Perlmutter

19 Oct 2026 · 1 min

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In this segment Dr. David Perlmutter emphasizes that sleep is the most critical pillar of health, surpassing diet and exercise. He warns that missing sleep for just a few days can be fatal. The discussion highlights the glymphatic system’s role in clearing brain waste during sleep, the importance of sleep for memory consolidation, and how sleep deprivation disrupts inflammation control, insulin function, and overall metabolic regulation. These physiological changes affect microglial cells, shifting them from supportive to potentially destructive states, underscoring sleep as a key regulator of brain health.

If you don't sleep for a few days, you won't survive.
I think it's also important that we touch on the importance of sleep and the glymphatic system and how important getting proper sleep and how detrimental sleep deprivation, at least over a prolonged period of time.
Sleep, eat, and exercise. Sleep might be clearly the most important of all 3. Diet's not great, exercise not often, you don't sleep well, you're done. Allowing your brain to contextualize your experience, to build new memories, and to help offload the debris that is accumulated, that your brain does in fact accumulate. Sleep is hugely influential in terms of inflammation, insulin functionality, and overall metabolic regulation. Those are the keys to the kingdom in terms of regulating your microglial cells, keeping them supportive or allowing them to become destructive.