Here's what's interesting:
* They sleep high in the trees: Orangutans build nests in trees for sleeping, which they often construct anew every night.
* They sleep in various positions: Orangutans sleep curled up, on their sides, or even on their backs, with their arms wrapped around themselves.
* They're mostly nocturnal: While not strictly nocturnal, orangutans tend to be more active at dawn and dusk.
Remember, these are just general estimates. Individual orangutans may sleep more or less depending on factors like age, health, and environment.