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2. Somnolence - Wikipedia

   en.wikipedia.org/wiki/Somnolence

   When a person is sufficiently fatigued, microsleeps may be experienced. In individuals deprived of sleep, somnolence may spontaneously dissipate for short periods of time; this phenomenon is the second wind , and results from the normal cycling of the circadian rhythm interfering with the processes the body carries out to prepare itself to rest.

3. Fatigue - Wikipedia

   en.wikipedia.org/wiki/Fatigue

   Fatigue in a medical context is used to cover experiences of low energy that are not caused by normal life. [2] [3]A 2021 review proposed a definition for fatigue as a starting point for discussion: "A multi-dimensional phenomenon in which the biophysiological, cognitive, motivational and emotional state of the body is affected resulting in significant impairment of the individual's ability to ...

4. Idiopathic chronic fatigue - Wikipedia

   en.wikipedia.org/wiki/Idiopathic_chronic_fatigue

   Prolonged fatigue is fatigue that persists for more than a month, and chronic fatigue is fatigue that lasts at least six consecutive months, which may be caused by a physical or psychological illness, or may be idiopathic (no known cause). [1] Chronic fatigue with a known cause is twice as common as idiopathic chronic fatigue. [6]

5. Post-exertional malaise - Wikipedia

   en.wikipedia.org/wiki/Post-exertional_malaise

   While fatigue is often prominent, it is "more than fatigue following a stressor". [6] Other symptoms that may occur during PEM include cognitive impairment, flu-like symptoms, pain, weakness, and trouble sleeping. [6] [4] Though typically cast as a worsening of existing symptoms, patients may experience some symptoms exclusively during PEM. [6]

6. Lethargy - Wikipedia

   en.wikipedia.org/wiki/Lethargy

   Lethargy is a state of tiredness, sleepiness, weariness, fatigue, sluggishness, or lack of energy. It can be accompanied by depression , decreased motivation, or apathy . Lethargy can be a normal response to inadequate sleep, overexertion, overworking, stress, lack of exercise, improper nutrition, drug abuse, boredom , or a symptom of an ...

7. Central nervous system fatigue - Wikipedia

   en.wikipedia.org/wiki/Central_Nervous_System_Fatigue

   Central nervous system fatigue, or central fatigue, is a form of fatigue that is associated with changes in the synaptic concentration of neurotransmitters within the central nervous system (CNS; including the brain and spinal cord) which affects exercise performance and muscle function and cannot be explained by peripheral factors that affect muscle function.

8. Effects of fatigue on safety - Wikipedia

   en.wikipedia.org/wiki/Effects_of_fatigue_on_safety

   Fatigue can be both physical and mental. Physical fatigue is the inability to continue functioning at the level of one's normal abilities; a person with physical fatigue cannot lift as heavy a box or walk as far as he could if not fatigued. [3] [4] [5] Mental fatigue, on the other hand, rather manifests in sleepiness or slowness. A person with ...

9. Altered level of consciousness - Wikipedia

   en.wikipedia.org/wiki/Altered_level_of_consciousness

   A mildly depressed level of consciousness or alertness may be classed as lethargy; someone in this state can be aroused with little difficulty. [1] People who are obtunded have a more depressed level of consciousness and cannot be fully aroused. [1] [2] Those who are not able to be aroused from a sleep-like state are said to be stuporous.