"Go-to-sleep-light" wanted

I guess I might need more "go-to-sleep-light" than wake-up light. This time I was "only" up until 2:30 am. I think it can't be expected then that I would be kind of fresh when I wake up on the morning. I lose really easily day rhythm, especially in dark time, so this winter I try to keep me waking up every morning at 9 am, also on weekends. We'll see how long time this promise is holding... Last year it really didn't work.