Are you thinking additional supplements/OTC/sleep aids, or more routine based stuff?
For OTC's things like 1-2 50mg Gravol can help, but Gravol can get addictive quickly. A lot of guys at my gym tend to like Melatonin, or if a doctor's available to you talk to her/him about a sleep aid like Lunesta. But with pills and such your body starts to get dependant on them so they're not ideal. And really bkultra is right. Benzos like Xanax or Ativan are often prescribed too. As an RN I've seen a lot and different things work for different people.
To avoid the dependence thing, more routine based actions can help. Do things in the same order each night you're getting ready to go to bed, but make sure it's different from your morning routine (it can confuse your body if they're the same, because your morning routine is associated with waking up, so you do want to use the same exact order when you're trying to wind down for the evening). Avoid caffeine a few hours before going to bed, and alcohol. Alcohol is funny in that it depresses your CNS at first, but then your CNS rebounds and it winds you up again. Take hot showers before bed (heat dilates your blood vessels and as you start cooling down after your shower it's a natural signal to your body to start preparing for rest, like how your circadian rhythm works).
-Steve