Yes, it’s very normal, and quite common. I live in northern Canada, where the winters are long and dark. From November to March, the sun rises on average at 9 pm. and sets at 4:30 pm. We have very short days in winter.
When I was growing up, I used to feel “blue” when night fell. I know what you mean shego. It’s like two different worlds, night and day. It started to get worse in the fall, when school started, and the combination of school, stress, and early nightfall was onerous indeed.
As I grew older, I realize that it was part of SAD (seasonal affective disorder). I read an article about it, and someone recommended turning on as much lights in the house as night fell. “Light therapy” helps a lot of people, by changing the levels of hormones in the brain responsible for depression.
But I sometimes feel this way in summer too. I think it’s an evolutionary/biological thing too——we’re supposed to be sleeping as night falls, not awake and “thinking” about things and doing things.
I remember when I was in high school, and I felt this way at night, and wondered if I was the only person who felt like this. I was a big ABBA fan then, and one day I bought one of their albums and to my surprise, found a song by them that spoke to me about how I felt. It was like “Gee, it’s not an uncommon problem after all. Millions of people must suffer from this.” Anyhow, here’s the song that sort of “helped” me (lol)—-
http://www.youtube.com/watch?v=gS4-It4dG80&feature=related