17/08/2022
Monkeys often sleep in the bottom layer of the tree canopy, avoiding the top canopy where it is cold and windy. At night they form large sleeping clusters. There are several hypotheses that explain the formation of dense sleeping groups, the most important of which is the process of thermoregulation. The thermoregulatory hypothesis proposes that the primary function of sleep in dense groups is to conserve heat at low temperatures. Along with thermoregulation, safety from predators is an important principle underlying the formation of sleeping clusters in primates.
