Some experiments in the chemistry of normal sleep.

Sleep is essential for physical and niental health. In the last 15 years there has grown up the concept of the brain stem reticular activating system. Electroencephalographic studies have shown two qualitatively different and alternat ing kinds of sleep, the orthodox (“slowwave―, or “¿ fore-brain―) and the paradoxical (“hind brain―, “¿ rapid eye movement―, “¿ activated―, or “¿ dreaming―) phases (Akert et at., 1965). It may be predicted that in the next decade