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In the first half of the night, the majority of your 90-minute sleep cycles [are] going to be 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 that seesaw balance will actually change, and instead, the majority of those 90-minute cycles are going to be comprised of much more rapid eye movement sleep, or dream
sleep.
Matthew Walker
The Typical Architecture of a 90-Minute Sleep Cycle: Non-REM vs. REM
#01 What is Sleep? (aka What's going to happen when you fall asleep tonight?)
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