#4 is a big one. The more time one spends in bed not sleeping or having the sex, the more likely it becomes that they will struggle with falling asleep. That

#4 is a big one. The more time one spends in bed not sleeping or having the sex, the more likely it becomes that they will struggle with falling asleep. That said, some people are built different and can do all sorts of crap in bed and still sleep alright.