Do Flyes Sleep?

Sleep is absolutely universal, but maybe it's just because everything needs a break every once in a while. There are certain chemical energy requirements that you need to be awake and there are certain bodily functions that can only happen when you aren't moving. I feel like dreams are more active than people might think. When you're conscious and thinking about something, if you're afraid of something, your thinking about it may have an unrealistic or abstract meaning. It seems like it comes from consciousness; i don't know how the details of that works at this point. Mark on the same train.