It’s Presidents’ Day, and there are cheap mattress sales everywhere you look. This is one of the best times in the year to pick up a mattress on the cheap, but there’s a knack to snagging the best deal. I’ve been writing about mattresses for years, and monitoring prices and deals patterns, and have picked up some top tips for maximizing your savings. Below I’ll explain the biggest mistakes I see people making when shopping for a mattress bargain, so you can avoid making the same blunders in this year’s Presidents’ Day mattress sales.