Sleeping was when a person was in a state of sleep; which was a deep state of rest that most animal species, including humans, had to take part in, usually at regular nighttime intervals. Dreaming was common during sleep, which would cause a person's unconscious mind to enter the Dream World.
- ↑ As seen in the Superfriends season one episode The Ultra Beam (1973).
- ↑ As seen in The Ultra Beam.
- ↑ As seen in The Menace of the White Dwarf.