Nest-building in primates refers to the behavior of building nests by prosimians and great apes. Prosimians build nests for both sleeping and also for raising families. Great apes build nests for sleeping at night, and in some species, for sleeping during the day. Nest-building by great apes is learned by infants watching the mother and others in the group – it is considered to be tool use rather than animal architecture.  Extant monkeys,both old and new world, no longer nest. 
It has been speculated that a major evolutionary advance in the cognitive abilities of hominoids may first have occurred due to the development of nest-building behaviour and that the transition from nest-building to ground-sleeping led to “modifications in the quality and quantity of hominid sleep, which in turn may have enhanced waking survival skills through priming, promoted creativity and innovation, and aided the consolidation of procedural memories”.
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