the adictiveness of sleep aids is usually subjective - some people feel they can't get to sleep without them and will then stay on them... it's more of a personal need than actual dependency. i keep sleeping pills in my room if i ever have massive trouble getting to sleep.. but i may only take one once a month or so. they're pretty good for this reason.
i know i won't sleep the day before exams, so i'll try and sleep in the morning (before doing work) and again in the late afternoon. it fucking ruins your day, but is probably the only way to get back to a somewhat decent sleep cycle. i will need sleeping pills to fix that.
try novel hypnotic like Zopiclone in it's weakest form (7.5mg I think). half the pill is sufficient to get you over to sleep as it requires only a very small activity to work. it's an odd one though, as sometimes it works fantastically, sometimes it doesn't at all. the best way to work with it is to get into bed right after taking it, with no stimulus, but you should feel quite rested after even a little sleep. grogginess leaves quite quickly in me (i take a similar pill), but if i snooze after i have woke up initially i could probably sleep on. easiest way to do things is to get up the second you wake, and walk it off.