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Commonly used to describe a situation in which a person spends a long period of time forgoing sleep and sometimes other necessities to prepare for something. Hell Week gets its origins from the Fifth week of the First Phase of BUD/S (for those of you who don't know what it is, it is the training course that Navy SEALs go through) where for five days, they are subjected to living hell where with no sleep, they are required to perform strenuous physical activity in combat conditions at Olympic standards.
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