Yes, monkeys do sleep at night, much like many other primates and mammals. Most monkey species are diurnal, meaning they are active during the day and rest at night. They typically seek out safe locations in trees or other sheltered areas to sleep.
Monkeys, like humans, have a natural circadian rhythm that governs their sleep-wake cycles. This rhythm is influenced by environmental factors such as light and temperature. When night falls, monkeys tend to settle down, reduce their activity, and engage in social grooming or cuddling with their troop members, which helps strengthen social bonds.
However, there are some exceptions in the primate world. For example, certain species may exhibit nocturnal behavior and be active at night. But for the majority of monkey species, nighttime is dedicated to rest and sleep, ensuring they conserve energy for the next day of foraging and social interactions.