Getting a workout during the day is usually enough for me. By the time it's bedtime I'm usually half asleep already.
I also find a single glass of wine will help put me to sleep and isn't enough to interfere with my sleeping. If I've drank too much then I'll fall asleep easily, but I won't sleep as well as normal. I've been drinking hot apple cider a lot recently too.
Reading is good if it isn't something too exciting. I really enjoyed reading the Lord of the Rings, but after a chapter or two at night I was ready for bed.
Having an animal around has been working well, too. I find that at home, my wife and I pay attention to her (our Welsh Corgi) a lot, so things like work and other stressers aren't on my mind. After she goes to bed, it's not long before we're ready to sleep, too. Heading from the basement to the ground floor evey couple of minutes to either let her out or in might have something to do with it, too.
One of most important things for me is to make sure my mind isn't running overtime when I try to go to bed. If it is, trying to lay down to go to sleep is counterproductive. I'll get up and surf the internet or read for a bit to get myself calmed down.
The other most important thing is for me to have a regular schedule. If I'm going to bed and getting up at the same time every day, it's easy to fall asleep at night and to get up in the mornings.