Should Mattress Be Smaller Than Bed Frame. According to cheapbedsale.co.uk, the best way to go is to choose the mattress first and then the frame. If yours is the wrong size, get a new mattress.
It is best to keep your nightstand a bit higher than your bed. Then, select the stand which is equal to or larger than the mattress. A bed frame should be no more than five inches bigger than a mattress in any direction.