Sleep
 | A period of rest during which the person sleeping loses awareness of their surroundings. |
| A sleeping person can be awakened easily, unlike in a coma, by a loud noise or bright light. |
| Humans and other animals must have a certain number of hours of sleep to survive. |
| During sleep you : |
Muscles relax
Dream
Heartbeat and breathing rate slows down
Become less aware of your surroundings
Change positions at least 12 times
| Scientists study sleep with am Electroencephalograph which measures and records electrical waves from the brain. |
| The Brain of an awake yet relaxed person gives off about 10 small waves per second and as the person starts to sleep the waves grow larger and are slower. |
| Since some people’s jobs are at night some sleep during the daytime. |
| Some people need more or less sleep than 7- 81/2 hours a day. |
| Sleeping patterns develop gradually. |
| Babies usually sleep for brief periods throughout the day. |
| 4- year olds get 10 –14 hours of sleep average for a day and 10- year olds get 9- 12 hours of sleep average per day. |
| Only reptiles, birds and mammals really sleep. |
| Most reptiles do not have sleep periods. |
| Birds have very brief sleep periods. |
| Mammals have periods of dreaming sleep and slow- wave sleep. |
| Some mammals such as cattle sleep standing up, but can only dream while lying down. |
| 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. |
| Humans have gone without sleep for 11 days but they lose contact with reality for periods of time and think people are what they aren’t. |
| Sleep restores energy to the body. |
| 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. |
· 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.
· You are most likely to sleepwalk during a period of tension or worry.
· Most people that sleepwalk do not remember what they have done.
· Sleepwalking occurs during deep sleep not dreaming sleep.
· Most sleepwalking is harmless but you could fall out a window of down stairs or running into something.
· It does not hurt to be awakened during sleepwalking.
Stage 1- alpha (drowsiness)