How do spider monkeys sleep?

Spider monkeys are highly social and live in groups of up to 30 individuals. They are arboreal, meaning that they spend most of their time in trees. They are also diurnal, meaning that they are active during the day. At night, spider monkeys sleep in the trees. They typically curl up into a ball and sleep on a branch or in a fork in the tree. They may also sleep in a communal nest with other members of their group.