- Get plenty of sleep before you leave.
- Don't drink a lot of alcohol.
- Eat well-balanced meals.
- Avoid overheating.
- Exercise as much as you can on your trip.
- Use sleep medicines for only a few days.
- Get used to a new time zone by going along with the local meal and bedtime schedules.
- Even healthypeople can get blood clotes in their legs after long flights. Try to walk every now & then during the flight (unless the crew tells you not to ).
- Drink water, stretch your calf muscles while you're sitting and wear support stockings.
Source : TOI