|MadSci Network: General Biology|
That's not an easy question. No insects enter a state that is exactly like human sleep, but many insects do rest during the day or night. These rests are called quiescent periods. Insects in these resting periods have a slower metabolism--that is, their body functions (including breath and heart rates) slow down and use less energy. But, during these rests, insects do not "close their eyes" like we do, because they don't have eyelids. Also, insects must stay somewhat alert during these rests to ensure that they are not eaten by predators.
In addition to these daily resting periods, most insects enter a yearly deep sleep called diapause. Diapause is similar to hibernation.
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