Human beings are the only mammals that can delay sleep

Whatever their preferred mode, animals including bats, elephants, frogs, honeybees, humans, and more all sleep. In actuality, no completely sleepless animal has yet been discovered. However, human beings seem to be the only one that can delay sleep. Very few animals will sleep on bare ground if given the option for a softer surface. Many animals make a bed out of leaves, tree boughs, grasses, and whatever happens to be around, but all of them will sleep when it's time for them to do so. It is because their bodies work that way by instinct, to give them the energy they need, and maintain their body temperature.

Human beings' bodies also know that by instinct, that's why we get sleepy at night or when we're tired. However, the human brain is more developed than that of other animals, therefore it can delay sleep to prioritize other activities at the moment. This way of function also has a side effect, which makes the human body work less efficiently and demands a make-up sleep. Interestingly enough, even though they always go to sleep on time, many species other than human beings find struggle with sleeping. There is proof that animals, including insects, can have insomnia. They often put on more weight, pick things up more slowly, and lose their balance, all of which are symptoms of sleep deprivation that humans can experience.