Animals generally need to sleep, only in this way they can get enough rest, consumed energy can be supplemented. Penguins also sleep, but we don't often see penguins, and we don't usually see them sleep, so some people may think that they don't sleep. In fact, penguins spend part of their time sleeping, but their sleeping time may not be consistent throughout the day. For example, if the temperature can reach more than 0 degrees during a day of polar daylight, king penguins may spend nearly half of the day sleeping.
The above has been introduced, penguins also need to sleep. When they sleep, their postures are different. Most penguins sleep standing up. In this way, they can sense the danger around them at any time and escape in time when they encounter danger. However, some penguins sleep on their stomachs or lying down. Such sleeping penguins are generally small penguins, their sense of danger is not enough, and there will be large penguins around to take care of them, do not have to stand to sleep to perceive danger. In addition, sometimes we can observe all kinds of strange sleeping positions, such as several penguins sleeping together.
Penguins are social animals, often in groups. So while most of the penguins in a colony are resting, a few are still awake, and they act as "sentinels". When they find danger, they will make a sound to wake up their companions around them, and then they will move to other places together, and then continue to sleep.
