I'm a doctor and also have to endure some pretty awful shift work and so have a bit of an interest in sleep.
Studies have shown that eating a banana (this is not a wind up) an hour before sleeping can help with somnelance (falling asleep).
Also there is a milk available in supermarkets now (may only be sainsbury's/waitrose) that apparantly contains higher than normal amounts of melatonin and so aids sleep.
The problem with pills such as zopiclone and temazepam etc is that they all have side effects whether it be some sort of hangover/drowsiness or even hallucinations.