Fish and Amphibians have periods where they become less aware of their surroundings but do not sleep. Insects and spiders have daily periods of reduced activity but do not sleep. Without sleep you could become quick- tempered and lose energy. After 2 days without sleep long periods of concentration become hard. After 3 days without sleep you have great difficulty thinking, seeing, and hearing clearly.
People require slow- wave sleep and dreaming sleep.
Slow- wave sleep helps in building protein and restoring control of the brain and nervous system over the muscles glands and other body systems. Walking A condition during which a partly awakened sleeper performs various physical activities. Most sleepwalkers just sit up in bed and or near it. Some people get up and walk around but few perform complicated actions. Sleepwalking is more common among children that adults.