Thanks, everybody. After reading your responses I think that the most important thing I have to do is to establish a regular schedule. I don't really have a work schedule because my Uni courses are different from semester to semester and I have to be up at differing times. The last semester my first courses weren't earlier than 12 pm! Maybe it would be easier if I have to get up at the same time everyday.
Elly, I get the thing about having time for yourself. You're right, in a way. I'm on my way most of the day and when you live in a city like Berlin you always have a lot of people around you wherever you go. I live alone, so I have the time for myself when I get home in the evening. BUT as you mentioned I'm also online for most of the evening. I should try to change this a little bit, maybe with a 'no PC after 11 pm' rule?
Catherine, I also think that this is really the most important thing, not to force it.
AJ, I'm not sure exercise in the evening would work for me... I would be happy to get sleepy at 2 am most nights!
Khris, it seems to be coming back to the regular schedule thing. I only drink alcohol when I'm going out, so that's not an issue. Although I'm guilty of drinking coffee and black tee in the afternoon. I got Valerian Root when I had the anxiety problem, but it didn't really help me with my sleep.
Elisabeth, I should go with the no coffee after noon rule.
Lyn, god idea about the hot waterbottle and the sleepy-time tea!
Kafe, I've never thought about gluten being the cause for this before. It could be possible, but I think it unlikely. My sleep problems started when I had trouble with anxiety and a reactive depression and that's very common. Sometimes the insomnia dissapears with the depression, but sometimes it stays.
Thanks, Kari! I think dimming the lights could help, I'll try it. And stop using the computer before I go to bed. There are many night owls on my father's side of the family, so I may be at a disadvantage. I haven't talked with my doctor yet. I want to try to change some things myself first and see if something works. I try to avoid taking anything as much as possible.