There seems to be some confusion, possibly because:
* They spend a lot of time sleeping: Koalas are known for their sleepiness. They can sleep up to 18-22 hours a day, often during the hottest part of the day, to conserve energy.
* They are often seen resting in trees: Because they are so inactive during the day, they are often observed resting in trees, which might lead people to think they are nocturnal.
So, while they may appear to be nocturnal due to their sleep habits, they are actually active during the day, feeding on eucalyptus leaves and basking in the sun.