Hypnos (the Greek god of sleep) and Thanatos (death) were the twin sons of Nyx, the goddess of night (Fox, 1964). Hypnos lived in a dusky valley in the land of the Cimerians, watered by Lethe, the river of forgetfulness. He brought sleep to both men and gods, and sometimes sent his sons Morpheus, Icelus, and Phantasus to appear in dreams. At the door of his abode grew poppies and other herbs which induce sleep (Hamilton, 1961). This book deals with these herbs and their subsequent imitations. Before launching into an examination of hypnotics, it might be well to comment briefly on the manner...