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. Author manuscript; available in PMC: 2022 Jan 15.
Published in final edited form as: Neuroscience. 1999;91(1):391–400. doi: 10.1016/s0306-4522(98)00588-0

Fig. 5.

Fig. 5.

Histogram showing distribution of intervals from onset of REM sleep period to onset of subsequent REM sleep based on 48-h recording period. The modal sleep cycle interval in the platypus is 15 min.