A handful of easy things:

• Alcohol, even a little, even a few hours before bed, really throws off sleep cycles. I've seen this in my own data, and it's ... striking.
• Regular sleep schedules are a big deal for a lot of people.
• Getting some sun exposure during the day has a pretty big effect.
• Caffeine sticks around for around twelve hours -- more if you go nuts. Plan accordingly.
• Eat dinner early, if you eat dinner and you can.

Good luck! Sleep challenges suck ass.