Give lucid dreaming a try. I read a few books on the subject. Unfortunately, I could never get it to work.I'm in Florida, so yeah, tons of sunlight in the summer. I tried melatonin in the past, but the dreams were crazy as hell. I may try it again and see what happens though.
Interesting that you find a seasonal component in your sleep habits, and I suppose it makes sense as noted by one or more of the previous posters. However, my insomnia or fractured sleep normally seems to be situational rather than seasonal.