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Astronauts Richard H. Truly and Guion Bluford sleeping on board the Challenger. Bluford, in the foreground (upside-down) wears a sleep mask. Astronauts may find it difficult to sleep in space, especially if they are light sensitive.

Sleep mask

A blindfold (from Middle English blindfellen) is a garment, usually of cloth, tied to one's head to cover the eyes to disable the wearer's sight. While a properly fitted blindfold prevents sight even if the eyes are open, a poorly tied or trick blindfold may let the wearer see around or even through the blindfold.