My sleeping tips are as following:
- Always sleep before 11:30p.m. (Ok... I admit that it's considered a tough target for most students, but it worths a try, don't you agree?)
- Keep the light and sound OUT. (However for some rare cases, playing specific sound/music for the patients is a good way to calm down their mind and allow them to sleep well and tight.)
- Stop eating at least 3 hours before you sleep. (Or else it will ruin your biological clock)
- Keep your body warm, especially your feet.
- A standard time span of sleeping for adult is in between 7 and 8 hours.