It is quite common to hear that people with TS have trouble getting to sleep at night. It seems that some TS people have trouble with their natural internal clock not kicking in when the sun starts to set to tell the brain it's time for sleep now. There has been evidence that taking melatonin, a natural ingredient that our bodies produce, before bedtime will help with that "getting to sleep" issue, just like it does for pilots experiencing jet lag.
Here is a site to help you explore it further.
Melatonin Info Here
What has been your experience with using melatonin? Do you know anyone who uses it to help them settle at night?