No, I'm not unhappy. That's Seasonal Affective Disorder. Most people think of winter depression when they hear the term SAD. A small percentage of the population suffers from summer SAD. Summer SAD is insomnia due to too much sunlight. I just read about a study they did in some northern latitude countries on suicide rates. They go UP in the summer. It's all that midnight sun that keeps people awake.
I've come to think of it as nap season. I really can't take drugs for the most part, I'm either waaaaaaay too sensitive or allergic to everything for that. I can at least nap during the day when the light level stays the same. If I can go to sleep in the afternoon then I can take a half decent nap. My room is very dark even during the day so that helps some.
Needless to say I don't get as much done during the couple of months of nap season. The worst is from about the end of May until the middle of August or so.