The time each person starts their REM cycles is different for everybody, but it is usually 4-6 hours after you first fall asleep. The first REM cycle is usually only 10-15 minutes, followed by a brief period of lighter sleep, but you are still asleep. Then, you go back into an REM period only longer, about 20-30 minutes, and then enter another lighter sleep. This continues until the REM cycle is about 90 minutes which is often followed by waking up. This is normally the 8 hour mark of total sleep. A good way to determine your REM cycles is to play around with WILD/WBTB, which requires you to wake up between REM periods.
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