Explain the functionality and stages of sleep. Discuss why sleep is important. (USLO 8.2).

Functionality and Stages of Sleep Click the flashcards below to learn about the functionality of sleep. Adaptive Function of Sleep Evolutionary psychologists hypothesize that sleep is needed in order to restore essential resources that were expended during the day. They also hypothesize that sleep patterns evolved to adapt to predatory risks which increase at night. Cognitive Function of Sleep There are clear impacts on cognitive functioning as a result of lack of sleep. There are also cognitive benefits associated with adequate sleep.