Sleep cycles and REM times also vary from cycle to cycle as well as from night to night. There might be a typical set of times that someone will enter REM, but they aren't guaranteed to be exactly the same every night. I've found that the times in sleep I have dreams and wake up, for instance, follow a general trend, but can start off as much as 30–45 or more minutes off (and usually become even more irregular as sleep continues), and there are nights where they are just completely oddball. It's a very dynamic process subject to all sorts of variables, and it takes fairly sophisticated equipment to actually determine when someone is in REM.
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