Wood can go crack over time. Particularly a creaking bed can be quite embarrassing. The problem arises because the wood has become too dry. The solution? Put a layer of hot water in a bucket and put it a piece Sunlight soap. Let the soapy water stand overnight, so the soap partially dissolves. Dip a cloth in the soapy water and make all the wooden parts of the bed or down the stairs quite moist. If necessary to repeat one more time, and you have no more trouble cracking!