Compare the sleep cycle of a dolphin to that of a human being.

Answer:

Responses may vary but should include some or all of the following information: A dolphin’s sleep cycle is very different from that of a human being. A dolphin’s unique biological situation (conscious breather, aquatic animal) makes it so that sleep, which rests the entire brain and is occasioned by the loss of conscious behavior, would be fatal. Instead, dolphins sleep with only one half of their brain at a time, and they regularly come to the surface for breath during one of their sleep cycles.