An experimental study of sleep (from the Physiological Laboratory of the Harvard Medical School and from Sidis Laboratory) . tal Study of Sleep One important characteristic of all subwaking states isthe formation of hallucinations which indicate states ofdissociation under which alone hallucinations can take falling asleep hallucinations crowd consciousness, and onawakening a crowd of phantastic percepts, often giving riseto disconnected dreams, haunt the halls of may possibly term the intermediary subwaking statesleading into sleep as hypnagogic states and the dream-
An experimental study of sleep (from the Physiological Laboratory of the Harvard Medical School and from Sidis Laboratory) . tal Study of Sleep One important characteristic of all subwaking states isthe formation of hallucinations which indicate states ofdissociation under which alone hallucinations can take falling asleep hallucinations crowd consciousness, and onawakening a crowd of phantastic percepts, often giving riseto disconnected dreams, haunt the halls of may possibly term the intermediary subwaking statesleading into sleep as hypnagogic states and the dream-hallucinations formed hypnagogic hallucinations; the inter-mediary subwaking states which arise on coming out ofsleep we may term hypnapagogic states (from ^ttvos, sleep;and aTraycD, lead away); the dream hallucinations formedmay be termed hypnapagogic hallucinations. In passingfrom waking states into sleep and again from sleep intowaking, we pass through those intermediary subwakingstates. We may graphically represent those intermediary,transient, subwaking states as follows: ilifcM-i-^^«J?ifi>A5i^.* In other words, in going to sleep or rising out of it aswell as in entering into hypnosis and its allied states andcoming out of them the transitory, subwaking, hypnoidalstates are passed through. The subwaking states maytherefore be regarded as truly intermediate. The subjectin passing through the subwaking hypnoidal states mayeither fall asleep or pass into hypnosis. Facts thus clearlyindicate that sleep-states are closely interconnected with An Experimental Study of Sleep 19 intermediary subwaking states discovered in my investi-gation of the subconscious. In the study of sleep then wemust devote our attention to the investigation of transitorysubwaking states which form the transition between wakingand sleeping. Chapter VThe Induction of Sleep-States OWING to the kindness of Dr. Walter B. Cannon, Pro-I fessor of Physiology at the Harvard Medical School,I was
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