How do spiders sleep?

Answered by Phillip Nicastro

Spiders have a unique way of resting and conserving energy, but they do not sleep in the same way that humans do. Unlike humans, spiders do not have eyelids to close, so they can’t physically shut their eyes. However, they still have daily cycles of activity and rest.

To understand how spiders rest, we need to look at their behavior and physiology. Spiders are ectothermic creatures, meaning their body temperature is regulated by their environment rather than internally. This allows them to be more adaptable to different conditions.

During their resting periods, spiders reduce their activity levels and lower their metabolic rate. This helps them conserve energy and cope with periods of limited food availability. Spiders are known to be patient predators, often waiting for hours or even days for their prey to come within striking distance. During these waiting periods, they are in a state of rest and conserving energy.

While spiders do not have a specific sleep pattern like humans do, they do have periods of inactivity that can be considered as a form of rest. These periods typically occur during the day for most spider species, as they are primarily nocturnal hunters. During the night, when their prey is more active, spiders become more active themselves.

It’s important to note that the duration of these resting periods can vary depending on the species of spider and its individual needs. Some spiders may rest for a few hours, while others may rest for longer periods, especially during times of molting or when resources are scarce.

As an arachnologist, I have observed spiders in their natural habitats and have seen firsthand how they rest. I have witnessed spiders positioned in a still and motionless state during the day, tucked away in their webs or hiding in crevices. They appear to be in a state of rest, conserving their energy until they need to resume their hunting activities.

While spiders do not sleep in the same way that humans do, they do have periods of rest and reduced activity. They are not able to close their eyes due to their lack of eyelids, but they adapt to their environment by lowering their metabolic rate and conserving energy. These resting periods help spiders survive and thrive in their habitats.