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  2. Fatigue - Wikipedia

    en.wikipedia.org/wiki/Fatigue

    Mental fatigue is a temporary inability to maintain optimal cognitive performance. The onset of mental fatigue during any cognitive activity is gradual, and depends upon an individual's cognitive ability, and also upon other factors, such as sleep deprivation and overall health. Mental fatigue has also been shown to decrease physical ...

  3. Directed attention fatigue - Wikipedia

    en.wikipedia.org/wiki/Directed_attention_fatigue

    In such cases, there is no anticipation of threat or harm present but still the result is fatigue. Characteristic of mental fatigue is difficulty focusing. For a mentally fatigued person, paying attention to something uninteresting is burdensome, even though focusing on something of great interest poses no particular challenge.

  4. 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 ...

  5. Why Am I Tired All the Time? We Have a Few Answers - AOL

    www.aol.com/why-am-tired-time-few-201000577.html

    6 Reasons You Might Be Tired All the Time. While it is normal to feel tired, sometimes it can be something more serious. In fact, fatigue is a key symptom of the following health conditions. 1 ...

  6. Cognitive disengagement syndrome - Wikipedia

    en.wikipedia.org/wiki/Cognitive_disengagement...

    Although Weikard mainly described a single disorder of attention resembling the combined presentation of ADHD, Crichton postulates an additional attention disorder, described as a "morbid diminution of its power or energy", and further explores possible "corporeal" and "mental" causes for the disorder (including "irregularities in diet ...

  7. Mental energy - Wikipedia

    en.wikipedia.org/wiki/Mental_energy

    Many people complain of low mental energy, which can interfere with work and daily activities. [1] Low mental energy and fatigue are major public health concerns. [1] People may pursue remedies or treatment for low mental energy. [1] Seeking to improve mental energy is a common reason that people take dietary supplements. [6]

  8. Psychological stress and sleep - Wikipedia

    en.wikipedia.org/wiki/Psychological_stress_and_Sleep

    In fact, many studies have found a bidirectional relationship between stress and sleep. This means that sleep quality can affect stress levels, and stress levels can affect sleep quality. Sleep change depends on the type of stressor, sleep perception, related psychiatric conditions, environmental factors, and physiological limits. [5] [6] [4] [7]

  9. Altered level of consciousness - Wikipedia

    en.wikipedia.org/wiki/Altered_level_of_consciousness

    Reflexes, such as the cough and gag reflexes, are also means of judging LOC. [12] Once the level of consciousness is determined, clinicians seek clues for the cause of any alteration. [9] Usually the first tests in the ER are pulse oximetry to determine if there is hypoxia, serum glucose levels to rule out hypoglycemia. A urine drug screen may ...

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