Will changing my diet help me to sleep better?

We are what we eat, and now researchers are saying that our diet affects how we sleep. A study, published in the journal Appetite found differences in the diets of people who slept for seven to eight hours a night compared with those snoozing for five.
Since less sleep is associated with high blood pressure, poorer blood-glucose control (increasing the risk of diabetes) and obesity (as is more sleep in some studies), shouldn't we eat the foods that are most likely to help us sleep a healthy amount? And does anyone know what foods these are?

Source  - Guardian