a) You can take off your shoes and be bare foot which is supposed to help.
b) You can ask for free eye shades from the flight crew.
c) Dont sleep the night before you are travelling, but if you fail to sleep in the aircraft can result in big time trouble when you land.
d) Alchohol is a good suggestion but dont do point (g) if you choose to do this and do not succeed 
e) Request for a middle of the flight seat at the time you are checking in and also a window seat so that others will not wake you up if you are sleeping for their toilet visits.
f) ask the hostess not to disturb you (if you sleep) for serving meal plus you can convey the messege to the person in the seat near you.
g) if every attempt to sleep fails after a few hours, try to find another soul facing the same problem and start an intellectual chat with them.

via indiamike

• Allow time for problems
• Stay calm
• Smiles get far better results
• Make sure you have a diversion
• There's always an upside
• Expect the unexpected

via yourpanama

1. Use sleeping pills. Consult your doctor but Ambien seems to be the drug of choice.

2. Bring a blanket and pillow.

3. Wear comfortable clothing. Smart travelers look sharp when boarding and deplaning but in between, they change out of their restrictive clothing and into pajamas, sweat pants and/or cozy socks.

4. Bring your iPod, Bose noise-canceling headset and earplugs.

5. Travel armed with magazines, newspapers and books.

6. Bring an eye mask. 

7. Use the First Class Sleeper (buy it here) or the Travel Rest Pillow. Click here for more gadgets.

8. Filter your air. I haven’t used this yet but I like the concept of filtering the re-circulating air (PlaneCleanAir.com).

9. Bring snacks.

10. Get your game on. If you are traveling with someone, bring a deck of cards or games.

11. Reserve a good seat! Your travel agent can be of great assistance with this.

12. Put on a smile and bring a box of chocolates.

via　medjet