Brighten, I didn't sleep well for at least two weeks, and after that I had many nights where I considered five hours a victory.
Calming tea helped, and like Chloe I stayed away from caffeine for the first probably six months.
Exercise in the daytime helps tremendously with sleep.
I used to get up instead of lie in bed, though. I would tend to ruminate and worry if I stayed awake in bed, tossing and turning. If I got up and had some toast and a warm drink, and read a few threads on here I was always able to go back to sleep. Sometimes it's just blood sugar, and the snack took care of that.