The thing is that especially at school (I'm at high school) I have problem with staying awake all the 45 minutes of the lesson. I just start to close my eyes and falling from my chair and writing nonsense lines in my exercise books. I can't stay awake even when I'm laying down and watching movie or reading a book, even if it's interesting for me and I'm not tired I suddenly fall asleep. But it's not as unpleasant as at school. Can somebody explain it to me? I already went to neurologist and she said I'm fine. One period I was thinking I have narcolepsy but I'm 90% sure it's not that.