sleep for any reason. You will be on the plane long enough to catch a few winks even if you are somewhat rested, and my advice is to take it when it comes; if your eyes start to droop, get out the eye covers and earplugs, and go with it. If you throw away a solid two-hour nap on a few extra rounds of Angry Birds, you might well be angry at yourself later. 6. Secure your stuff. A long-haul flight gives unscrupulous travelers all the more time to size up the location of your wallet, wait until you fall asleep and make a move on your luggage. Secure your valuables deep inside your bags where it would take a TSA X-ray machine to find them. Consider keeping items like your passport, credit cards and cash in a money belt under your clothes. 7. Consider a sleep aid. If you are planning to use sleep aids (including "natural" methods such as melatonin, or drugs such as Ambien), try them before you fly with them. A few years ago a friend gave me an Ambien pill for a red-eye flight from Honolulu to New York City, and the drug acted more like a stimulant than a sleep aid. I was awake the entire flight, and felt wretched to boot. These types of drugs can vary greatly in how they affect individuals, so you will want to try them at home before you rely on them on the plane. Dr. Timothy Hosea,