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Fatigue is a state of tiredness (which is not sleepiness), exhaustion [1] or loss of energy. [2] [3]Fatigue (in the medical sense) is sometimes associated with medical conditions including autoimmune disease, organ failure, chronic pain conditions, mood disorders, heart disease, infectious diseases, and post-infectious-disease states. [4]
It is crucial to aim for objective measures to quantify the sleepiness. A good measurement tool is the multiple sleep latency test (MSLT). It assesses the sleep onset latency during the course of one day—often from 8:00 to 16:00. [10] An average sleep onset latency of less than 5 minutes is an indication of pathological sleepiness. [11]
An oil painting of a young woman having a siesta, or an afternoon nap, which usually occurs after the mid-day meal.. Postprandial somnolence (colloquially known as food coma, after-dinner dip, or "the itis") is a normal state of drowsiness or lassitude following a meal.
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[22] [23] [non-primary source needed] A 2022 review by Sun et al. addressed whether directed attention fatigue is lessened after exposure to nature in mentally fatigued athletes. [24] Some of the reviewed studies used walks in nature, recorded video scenes of nature, pictures of nature scenes, or even nature sounds such as bird songs. [24]
Sleep propensity can be defined as the readiness to transition from wakefulness to sleep or the ability to stay asleep if already sleeping. [68] Sleep deprivation increases this propensity, which can be measured by polysomnography (PSG) as a reduction in sleep latency (the time needed to fall asleep). [69]
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Examples of such environmental modifications include using the bed for sleep and sex only, not for activities such as reading or watching television; waking up at the same time every morning, including on weekends; going to bed only when sleepy and when there is a high likelihood that sleep will occur; leaving the bed and beginning an activity ...