I used to do a lot of convention work - that meant leaving on Thu nite or Fri morning and flying to someplace in a different time zone, working on their time until Sun nite/Mon morning, then flying home. I found some Chinese herbal remedies that worked (you may need an OMD to build prescription for that), but also Melatonin helped with occasional hyped-up issues.
General wisdom says 1) EXERCISE (but at least 4-5 hrs before you plan to sleep; 2) warm milk; 3) cheese (really - I actually saw this on Dr Oz); 4) sex (yup, really); and 5) meditation practices, such as tensing and releasing each individual part of your body starting with the feet and moving north. Some people say counting sheep helps, but it doesn't work for me.
ALSO do not do stimulating things close to bedtime - these include watching TV, eating, working on the computer, even reading a good book, or drinking anything with caffeine or other stimulants, like black and green teas, Mountain Dew, etc.
And - latest research says naps are a good thing.....