Turtles are cold-blooded, so they need to sleep in warm environments. They are also prone to predators, and they will try to sleep where they feel most safe. Some examples of this include a sandy beach, a grassy patch, or a rock pile. If they are feeling threatened, they may even go inside their shell for safety. During the day, turtles tend to sunbathe in order to get enough warmth.
Most turtles will find a spot that they like and use it as their sleeping place night after night. Some of them will even move around a bit during the night, although they are not necessarily awake. They simply want to make sure that they are safe and that their surroundings have not changed during the night.
Some species of turtles will sleep underwater. This is because this is one of the most secure places for them to be in, especially since they are out of sight from their predators. Examples of turtles that sleep underwater include painted turtles, map turtles, mud turtles, and red-eared sliders.
Another type of turtle sleep is called brumation, which is a form of hibernating. This occurs when the turtle’s temperature, heart rate, and respiratory rates drop dramatically for an extended period of time. This is usually triggered by winter, and this can cause a turtle to not wake up for days at a time.
For this reason, if your turtle is sleeping excessively in the aquarium or tank, you should consider raising the temperature of the water. This will prevent your turtle from going into brumation and conserve energy.