Researchers created a lab-induced sleep state that mimics deep sleep's key features: CSF pressure changes and slow-wave brain activity. The protocol syncs heart rate, blood vessels, and lymph movement. Four hours of this synthetic sleep produced more deep-sleep physiology than seven hours of natural sleep.
Synthetic sleep just like, matches what sleep does without you actually sleeping. Well, you know, in the lab, we found these very unique states we could put people in. And one of the states we found is like, wow, we can put you in the state where we've entrained all your physiological systems. Your heart rate's going up and down, your vasculature is expanding, contracting, your lymph is moving. And then we even developed a measurement for measuring cerebral spinal fluid pressure in your head. And that signal would jump out. This is what happens during deep sleep. Deep sleep is when the glymphatic system opens up and you flush out all the metabolic byproducts through your brain. The second thing we see are huge slow wave brain activity. And this only pops up in deep sleep. That measurement's very difficult. But between the slow wave and the CSF pressure fluctuations, those are the two hallmarks of deep sleep. We've just said. Well, we really think that this is putting you in a deep sleep like state. We call it synthetic sleep. When he does the four hours in shift wave versus the seven hours natural, he gets more deep sleep in that time.
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