Sleeping pills may be helpful in enabling you to get adequate rest. It's very important not to drink alcohol for 24 hours before or after taking this type of drug. Being in a dark room facilitates deep, restful sleep. Unless you can make the room very dark, use sleep shades. Quiet is also important so use ear plugs when necessary.
Dehydration makes all of the symptoms of jet lag worse.
Make sure you have adequate fluid intake. Your body's biological clock is actually set to a cycle longer than 24 hours. This is why it is easier to wake up late than it is to wake up early and easier to stay up late than to fall asleep early. This is why jet lag is less of a problem when going east to west than the reverse. For trips of 72 hours or less, a different strategy is useful.