1. Unit 5 A Bug’s Sleep
Please refer to page 29

2. All animals need sleep…. or do they
All animals need sleep….or do they? Even mammal needs it, as well as birds and reptiles, such as snakes. Amphibians, like frogs, do not sleep. But what about insects? Do they need sleep?

3. Scientists have been trying to discover the truth about insect ”sleep” behavior for years. Scientists first thought insects did not need sleep. According to them, the insect brain wasn’t complex enough to need it.

4. Scientists said that some kinds of brain activity, like dreaming, were sleep behaviors. Insects do not dream, so scientists said that they did not sleep. They believed that insects “rested” instead.