Flat Sheet Providing Fitted Mattress Engagement

A sheet apparatus comprising:

• a bottom sheet, said bottom sheet adapted to engage upon a mattress where said mattress has a top surface surrounded by a sidewall where said sidewall extends a sidewall distance to a bottom surface of said mattress;
• said bottom sheet having a body, said body having a body area which is planar and extends to a perimeter edge of said body;
• said body having a rectangular central area with four corners thereof;
• edge portions of said body, said edge portions extending for an edge width from a perimeter edge of said central area, to said perimeter edge of said body;
• four biasing bands, each of said biasing bands having a central portion, said central portion extending between two opposing ends which are secured to said body at securement positions adjacent said perimeter edge of said central area;
• each of said four corners of said central area having one respective central portion of a respective said biasing band, extending thereover;
• and
• each respective central portion of each biasing band stretchable to a respective biased engagement at a respective corner of said mattress, said biased engagement positioning said central portion of said biasing band in a removable contact against said bottom surface of said mattress.