Behavioural sleep in the giraffe (Giraffa camelopardalis) in a zoological garden

@article{Tobler1996BehaviouralSI,
  title={Behavioural sleep in the giraffe (Giraffa camelopardalis) in a zoological garden},
  author={Irene Tobler and Barbara Schwierin},
  journal={Journal of Sleep Research},
  year={1996},
  volume={5}
}
Behavioural sleep was assessed for 152 nights in 5 adult, 2 immature and 1 juvenile giraffes at a zoological garden, using continuous time‐lapse video recording. Sleep occurred while the giraffes were standing (SS) and in recumbency (RS). Paradoxical sleep (PS) was recognized by the peculiar positioning of the head on the croup and by phasic events. The 24‐h sleep profile had a main bimodal nocturnal sleep period between 20.00 and 07.00 hours, with a trough between 02.00 and 04.00 hours, and… 
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References

SHOWING 1-10 OF 52 REFERENCES
Note on sleep in captive giraffes (Giraffa camelopardalis reticulata)
The relatively small amount of time spent sleeping by giraffes, can be attributed most directly to the need for constant rumination. This is consonant with the more general ecological notion that
Sleep in mammals
The relevance of drowsiness in the circadian cycle of farm animals.
Animal sleep: A review of sleep duration across phylogeny
Behavior and ecology of the Asiatic elephant in southeastern Ceylon
McKay, George M. Behavior and Ecology of the Asiatic Elephant in Southeastern Ceylon. Smithsonian Contributions to Zoology, number 125, 113 pages, 63 figures, 22 tables, 1973.—This paper reports on a
Sleep in Ruminants
TLDR
It was found that it was debatable if cows ever sleep; even at times of total rest they kept their eyes open except for very short periods—a few minutes at most—when they generally rested their heads on the flanks.
Varying photoperiod in the laboratory rat: profound effect on 24-h sleep pattern but no effect on sleep homeostasis.
TLDR
Computer simulations demonstrated that the changes of TCRT and EEG slow-wave activity can be largely accounted for by the sequence of the vigilance states, concluding that the photoperiod does not affect the basic processes underlying sleep regulation.
...
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