-exercise makes you tired
-give yourself an hour before your bed time to wind down - have a bath, read a book, have a non-caffinated hot drink
-avoid caffeine and other stimulants for 6 hours before bed time
-5-htp is an amino acid which you can buy in pill forms - it can be naturally found in food, but it has less of an effect if you get it from high protein foods (as the carrier which takes htp into the brain is also the carrier for other amino acids, so when you eat foods which also have a high number of the other amino acids, htp has to compete with the other amino acids for the carrier. however, if you really dont want to take pills, foods which have a high htp-to-other-amino-acids ratio are bananas, turkey, milk)