I have trouble falling asleep quite a bit. I sometimes end up laying in bed trying to go to sleep for a couple hours, usually on nights where I know I have to get up early the next morning and feel a need to go to sleep. I know you're obviously supposed to get however many hours of sleep a night, but is there any sort of way to determine the equivalence between just laying in bed and actually being asleep? How beneficial is it to simply try to go asleep? Can I equate X hours of laying in bed with Y hours of sleep?