Abstract
Abstract Electrographic technique supported by behavioural observations was used for recording of normal sleep and wakefulness in captive starlings, Sturnus vulgaris. Data were collected under natural illumination conditions. The starlings spent in sleep in autumn, mid‐winter and early spring 39.0%, 44.4% and 36.9% of the 24‐h period respectively. The amount of paradoxical sleep (PS) in birds in mid‐winter was three times greater than in the other seasons. An apparent increase in slow wave sleep (SWS) and decrease in PS in the course of the night were observed during all three seasons. These trends undergo slight seasonal changes. The present study suggests that some endogenous circannual rhythm modulates the sleep duration and the daily sleep‐wakefulness rhythm in the starling more strongly than the seasonal changes of the photoperiod.
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