4. Spiders are known to have circadian rhythms or daily periods of activity and rest.
In colder climates, spiders can hibernate. It allows them to live and survive in a kind of suspended state until the temperatures rise. While they are inactive, the spiders’ metabolism slows down. You can sort of tell whether spiders are sleeping or in hibernation by observing their body language. During hibernation, spiders tuck in their legs, and their metabolic rates slow to help them survive. Their metabolic rate slowing allows them not to have to burn as many calories. They can survive without eating and living in a sleeplike state until the cold weather ends.

The same tucked-in position also indicates a sleeping spider. However, if you see a spider laying on its back or in an awkward position with legs tucked, then it may not be alive. Spiders are pretty savvy about taking care of their odds for survival. They tend to hunt, nest, and sleep out of harm’s way. When spiders go into hibernation, they are most likely to be found in their webs. People might find them in protected places such as cracks in the walls. Triggers besides circadian rhythms and cold temperatures can cause spiders to become unconscious. For instance, female funnel-web spiders can lose consciousness during mating in response to males’ pheromones.