A common OTC combination for sleep is melatonin, Lemon Balm (Melissa), and Valerian Root. I find that even for amphetamine/stimulant induced insomnia this combination works exceptionally well. For my patients for whom this is not enough, I recommend adding in Chamomile tea or a sleepytime tea and L-Tryptophan. When that fails, I usually recommend a good orgasm, but that's the perspective of a herbalist and midwife.... *shrugs*