Poschan, early waking can be a sign of depression, specifically serotonin depletion. I had the same thing and am finally getting a bit better on that front. (maybe the SSRIs, maybe just the healing process?) Anyway, it was months of waking at daybreak and being unable to get back to sleep. It's no fun.
My doc initially gave me trazadone,which helped a LOT with getting to sleep, though it didn't do much for the early bird syndrome. I found that I had to just go to bed earlier to get some extra sleep. I developed a reaction to the trazadone, unfortunately, so now I'm taking antihistamines which aren't nearly as effective. I refuse to try anything like Ambien due to the sleep-walking, sleep-driving, etc. risk.
Be sure you mention your early wakening to your MD when you go for your appointment. Talk about all of your symptoms, even if they seems trivial. Your doc need to see the whole picture.
H: 44, Me: 45 Married: 20 y Together: 25 y no kids Walk away: 12/15 Asked for temp separation 12/25/15 PA confirmed 3/16 (apparently neither the first, nor the last PA he has had) H filed for D 5/16