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References :

Try using good sleep hygiene methods first. You seem to have got into a routine of sleeping from 6/7am until 3:30pm.

It’s not an easy option, but you could set yourself a routine whereby you only allow yourself to sleep between set hours (eg 11pm-7am). If you haven’t slept by 7am, then suck it up because you won’t be able to sleep again until 11pm that evening (trust me, by then you will be tired enough).

A less strenuous but slower option is to move your waking time back by an hour each day, so set an alarm for 2:30 and make sure you get out of bed when it goes off.

Don’t take naps in the day, even if you are tired. Go outside and get some fresh air instead (exercising early in the day will help you sleep). If you have a TV in your bedroom, move it out, and make sure your bedroom is dark and cool. Avoid caffeine after midday and don’t eat very late in the evening as this can keep you awake.

It sounds very rigid, but this is a much better long-term solution than sleeping tablets.
References :

Try the natural sleep aid Melatonin … wonderful product. I’ve used it many times when traveling to different time zones to get in sync with the local time.
References :

Natural Sleep Aid You’ll Sleep Peacefully - Every Night
Were you tossing and turning again last night? Counting sheep until
you’d gathered a whole flock? Beating your pillow to a pulp?
Were you staring at the ceiling thinking "I need some help! I’ve GOT to get some sleep!"?

http://www.melatrol.com/?aid=350982
References :
http://www.melatrol.com/?aid=350982

Melatonin is the best because it is a natural sleep aid.

Thanks
References :
http://www.sleepnaturalaids.com