The first half of the night is dominated by deep sleep (N3/slow wave sleep), while the latter half contains more REM sleep; going to bed too late reduces the amount of restorative deep sleep the body receives.
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Going to Bed Late Robs You of Deep SleepAdded:
The first half of the night is predominately by slow wave or deep sleep or N3 sleep. These are all synonymous.
N3, slow wave, deep sleep.
The latter half of the night is predominately by REM sleep.
And so if we rob ourselves of the first few hours of sleep assuming someone is a 8:00 p.m. to 4:00 a.m. sleeper, that's their 8-hour window.
Well, yeah, they're going to rob themselves of more deep sleep.
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