I actually have insomnia, and simultaneously my body builds tolerance to medication at a ridiculous rate, so sleeping meds aren't really an option for me. 

Thankfully my insomnia isn't too bad, it tends to come and go (And so long as I only take things to force myself to sleep sparingly I'm fine), but overall it leaves my sleeping patterns to be pretty erradic.

I tend to sleep better when I pass out around 3am or later, I find myself waking up more as the sun goes down. Which sucks because I usually work mornings, but you get use to it after a while.