How many METs is sleeping generally classified as?

Sleeping is generally classified as approximately 0.9 METs (Metabolic Equivalent of Task). METs are a way to measure the energy cost of physical activities. One MET is defined as the energy expenditure at rest, equivalent to an oxygen uptake of roughly 3.5 mL of oxygen per kilogram of body weight per minute.

When a person is sleeping, their body is in a state of rest and requires significantly less energy than when they are awake and active. The classification of 0.9 METs for sleeping acknowledges this reduced level of energy expenditure, as the body is primarily focused on maintenance and recovery processes during sleep. While sleeping, physiological functions like breathing and circulation continue, but they do so at a lower metabolic rate compared to other activities, justifying its classification at slightly below 1.0 MET.

Other activities classified with higher METs reflect more intense energy expenditures, thus setting sleeping distinctly lower in the metabolic hierarchy. Understanding this classification helps in accurately assessing daily energy expenditure and tailoring physical activity recommendations for individuals based on their lifestyles.