From approximately 3 AM onwards, the brain shifts its sleep pattern, showing a greater appetite for REM sleep, especially in individuals who naturally sleep later.

“at that point if you're sleeping there with someone like my face you are in a very REM sleep Desiring state that it's in those last morning hours and into the early morning hours when your brain wants to devour off the menu of sleep stages this thing called REM in vast quantities”

“but then from about 3:00 a.m. through until about midday then the brain shifts in terms of its pattern if you let people just sleep it out you know if you look at sort of extreme owls who and we should speak about Krone types at some point but people who you know like to go to bed very late and wake up very late essentially there then the buffet is gonna get hit hard in terms of REM sleep devouring”

“think of those different stages of sleep like a finger buffet and at different times of the night that buffet is going to be sort of you know consumed more heavily in terms of you know the deep non REM sleep phase which would probably be the hours from 9:00 p.m. through until about sort of 3:00 a.m. and that's really that the window of preferential appetite for your brain when it comes to deep non REM sleep”

“in the first half of the night the majority of your 90-minute sleep cycles are comprised of lots of deep non-rem sleep and very little rem sleep but as you push through to the second half of the night now the seesaw balance changes and the majority of those sleep cycles are comprised much more of rapid eye movement sleep and almost no deep sleep”

“In the late evening and the early morning hours, the brain has a dietary preference for deep sleep. And it doesn't very much have an appetite taste for REM sleep. Through to the second half of the night, that's when it gets its appetite for REM sleep.”