There are herbal preparations which can help you sleep, and are perfectly 'legal'. Example is "Calms".. .Be aware that temazepam is a tranquilliser in the same group as valium ("mother's little helper"). Not only do legitimate users become addicted to it, but it is used by drug addicts - and not approved for flying. Moreover, temazepam is even more sought after by "druggies" - you must have heard of "jellies"!