for most people, exercising/jogging usually enables them to
sleep well at night.
if it doesn't work for you, then it might be your sleeping
enviroment ba.
turn off all the lights except for a dim lamp. turn on the air-con
if its too stuffy. if possible, set a soft music playing. usually
this will get me to sleep in no time. 
some people also recommend reading a book before sleeping.
if all the above doesn't work for you then bo bian, go take some
sleeping pills la.
