Abstract: A sleep shell is provided comprising a flexibly foldable sheet material having complementary engageable side enclosures enabled to surround at least a user's torso. The sheet material has aligned recessed neck openings to form a neck hole when folded and at least a pair of complementary fasteners engageable with one another and disposed substantially toward the top side of the sheet material. An arm opening is also provided disposed selectively between top and bottom of the sheet material. The shell can be used for sleeping or as a blanket and allows a user to become ambulatory while wearing it.