So I have a vague idea about REM cycles, how they work, and when mine occur every night/morning. My problem is, how do I pin-point the *exact* times I enter REM sleep? Does everyone enter REM after 5-6 hours of sleep, or do you need more? And what if my REM cycles are late in the morning? For example, if I have to wake up at 7 for school and my REM starts at 8. Sorry for so many questions XD I'm just a little lost.