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I've tried melatonin, cutting out alcohol, f.lux, not looking at a screen for an hour before bed, but the one thing that has had the most influence on my sleep (for the better) is cutting out caffeine after 4pm. (relevant study: http://www.aasmnet.org/jcsm/ViewAbstract.aspx?pid=29198)

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All of the above + regular exercise.

this. if you race your mind whole day in highest gear, tired body helps a lot to drag it into abyss of good old hard sleep. plus gazillion other positive effects, if all is done right

Works for me too, combined with a consistent bedtime.

melatonin supplements only go so far. f.lux is indeed awesome. 4pm seems a bit late for me but he has a good point. Also exercise helps a lot ! unfortunately, it also requires the most effort.

Cut out caffeine a minimum 6 hours before one sleeps. Fun factoid: caffeine's half life is around 6 hours, and by then one is pretty much over all of its effects.

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