Sound sleep is something that every person wants, but on long-haul flights getting that be a huge task.
Taking a neck pillow with you is the most essential thing in long-haul flights. It helps you to sleep well.
In order to keep lights away, make sure you use an eye mask.
Wearing comfortable clothes actually does help in long-haul flights. Plus it will not restrict your movement in anyway while sleeping.
Try a little meditation to calm yourself which will eventually result in a sound sleep.
Carry a little essential oil with you so that you can smell it for some aromatherapy!
The biggest distraction these days is electronic devices, so make sure you switch them off.
Make sure you drink water and hydrate yourself well.
Have a sound sleep!