Feb 7, 2006

Sleep in captive chimpanzee (Pan troglodytes): the effects of individual and environmental factors on sleep duration and quality

Behavioural Brain Research
Elaine N Videan

Abstract

Various abiotic and social factors are hypothesized to influence sleep in primates. Chimpanzee sleeping behavior has been examined only in a limited fashion, both in the wild and in captivity. Previous research, however limited, has suggested that chimpanzee sleep is non-dynamic. This study used an objective behavioral model of sleep as a framework in which to test the hypothesis that changes in individual (age and sex) and environmental (temperature and humidity) factors influence sleep patterns in 20 captive chimpanzees. The nocturnal behavior of the subjects was recorded continuously using video cameras equipped with enhanced nighttime visibility connected to time-lapse videocassette recorders. Chimpanzees in this study slept 8.81 h per night, close to the averages reported for both industrialized and traditional human societies (7-9h), as opposed to that of previous chimpanzee studies (11-12h). Also, the idea that chimpanzees sleep in one continuous period with little to no nocturnal awakenings was also refuted. Captive chimpanzee sleep behavior was, in fact, dynamic and complex with frequent awakenings. Older chimpanzees slept longer, had higher sleep quality, and shorter nighttime disturbances than prime adult chimpanzees...Continue Reading

Mentioned in this Paper

Fluctuation
Callithrix jacchus jacchus
Behavior, Animal
Sleep, Slow-Wave
Harassment, Non-Sexual
Pan troglodytes
Pan paniscus
Primates
Humidity
Posture brand of calcium phosphate, tribasic

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