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• ### Lethargy

Lethargy is a state of tiredness, weariness, fatigue, 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, boredom, or a symptom of an illness or a disorder. It may also be a side-effect of medication or caused by an interaction between medications or medication(s) and alcohol. When part of a normal response, lethargy often resolves with rest, adequate sleep, decreased stress, physical exercise and good nutrition. Lethargy's symptoms can last days or even months.

• ### Lethargy (band)

Lethargy was a technical death metal band formed in Rochester, New York in 1992 and disbanded in December 1999. Their last performance was on Christmas night of 1999. Drummer Brann Dailor and guitarist Bill Kelliher would later appear in Today Is the Day and Mastodon. Guitarist and vocalist Erik Burke is currently active in Nuclear Assault, Sulaco, Kalibas, Brutal Truth, and B.C.T. (Blatant Crap Taste).

• ### Lethargy theorem

In mathematics, a lethargy theorem is a statement about the distance of points in a metric space from members of a sequence of subspaces; one application in numerical analysis is to approximation theory, where such theorems quantify the difficulty of approximating general functions by functions of special form, such as polynomials. In more recent work, the convergence of a sequence of operators is studied: these operators generalise the projections of the earlier work.

• ### Springtime lethargy

Springtime lethargy refers to a state of fatigue, lowered energy, or depression, associated with the onset of spring. Such a state may be caused by a normal reaction to warmer temperatures, or it may have a medical basis, such as allergies or "reverse" seasonal affective disorder. In many regions, there is a springtime peak in suicide rates.

• ### Lethargic Lad

Lethargic Lad is a protagonist in the comic strip of the same name, created by Greg Hyland sometime in the late 1980s. The character is notable for being very slow and inactive. Lethargic Lad does not speak, though he sometimes mutters "Umm...".

• ### Catoptria lythargyrella

Catoptria lythargyrella is a species of moth of the family Crambidae. It is found in Europe.

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