Behavioral sleep in Dscheladas in the zoo

Dscheladas have a marked polyphasic sleep pattern, however, as most primates, they do sleep primarily at night.

They huddle in a sitting position on their "sleeping board". Four individuals are visible, the adult male to the left, two infants are huddled behind their mothers (to the right of the male and first animal to the right) and not visible.

The animals remain sitting, sleeping in this position for many minutes, until one or all individuals move.

The head often rests on the chest, or sometimes a larger animal, in the video the adult male, can rest its head on a neighbour.

Still image of infrared time-lapse video (Duration: 21 sec.)