Figure 2

CHARACTERISTIC RHYTHMS associated with deep sleep in a cat (group of traces at right) are 90 much like those of wakefulnes6 (left group) and 6C different from those of light sleep (middle group) that the author has applied the term "paradoxical" to deep sleep. Normal cats spend about two-thirds of the time sleeping. They u6ually begin each sleep period with 25 minutes of light sleep, followed by 6ix or seven minutes of paradoxical sleep. In the latter state they are hard to wake and their muscle6 are relaxed.

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