Wear an Eye Mask
According to the National Sleep Foundation, light is the most powerful regulator of your biological clock. So if you need to trick your body into thinking it's bedtime, a good eye mask can help. Most of the masks sold at the airport (or provided onboard) aren't sturdy or dark enough to do the trick. Invest in a mask that blocks all light but still gives your eyes room to move around during REM cycles. We like contoured blackout eye masks, such as the Dream Essentials Sweet Dreams model.