Create as much routine as you can. Get to bed at the same time and wake up at the same time. Eat regularly meals at about the same time as well
Watch your sleep and get on a regular schedule
Pay attention to how your body responds to certain demands including food. Last week I had an Italian Ice (for the first time in a year) and I was wired for about 45 minutes from all the sugar.
Get as much light as you can in the morning once you awaken and create dark at night
Track your body energy from the time you wake up until you go to bed for a week or so to notice how you respond during the course of the day.