Sleep is characterized by certain patterns of activity of the brain that can be visualized using electroencephalography (EEG). Different phases of sleep can be differentiated using EEG as well.

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Sleep is distinguished by low levels of physical activity and reduced sensory awareness. A definition of sleep must also include the interplay of the circadian and homeostatic mechanisms that regulate sleep.

Definition of Sleep

Spielman, R. M., Jenkins, W. J., & Lovett, M. D. (2020, April 22). Psychology (2nd ed.). OpenStax. https://openstax.org/books/psychology-2e/pages/1-introduction

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