In a 2010 poll of 1,000 women, 25 percent admitted to sleeping in their makeup up to three times per week. This, despite admonishments from mothers and aestheticians alike, is probably why beauty junkies are lining up to buy a new foundation created especially for the horizontal hours. Do you sleep in your makeup? Why or why not? Would you buy a product made to make you look better in bed? Spill your beauty secrets in the comments.