If I really can't get to sleep then I usually crack out the old ipod and listen to one song that I really like but isn't relaxing reasonably loud (at the moment it is usually something by Clavin Harris) and then listen to three songs that I like but do find relaxing quite quietly, getting quieter with each one (currently JayZ & Mr Hudson - Forever Young, Dead Mau5 and Kaskada - I Remember and The Smashing Pumpkins - 1979) works 99% of the time, am usually almost asleep by the end of 1979.