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A survey is presented of the author's own investigations on the effects of ambient temperature and photoperiod on sleep in corvids. Daily sleep patterns of rook, Corvus frugilegus and magpie, Pica pica have been studied electrographically under natural ambient conditions of light and temperature. The daily amount of total sleep time (TST) was positively correlated with night duration, whereas the proportion of TST spent in paradoxical sleep (PS) was strongly reduced in low ambient temperaturepmid:2638547 fatcat:fg7i4n6tdnavdmjk7isk4mm33a