Purpose of Sleep Flashcards
Restorative Theory
What is it?
Evidence
Criticisms
a theory that states that sleep is vital for replenishing and revitalising the body and the mind to keep them functioning at optimal levels
research shows that following vigorous activity there is an increase in NREM sleep ad the body needs more replenishing. Similarly, we experience longer periods of REM after being deprived of REM sleep.
While dreaming, the brain is active when it is supposed to be conserving energy.
People that are inactive (bed-ridden) experience as much NREM sleep as active individuals
Adaptive Theory
What is it?
Evidence
Criticisms
a theory that suggests we sleep when we do not need to engage in activities important to our survival, and animals that are sleeping are less likely to be attacked. Sleep depends on vulnerability to predators, the need to find food and the need to conserve energy.
animals that have few physical needs sleep for longer than animals with greater physical needs.
One of the activities necessary for survival is the simple act of staying alive. Small animals with many predators should therefore stay awake - not be asleep - for much of the day so they can be alert to attack.
