Abstract: A dividable mattress for use in providing separation between the bedmates of a bed. The dividable mattress has two dividers and two parallel slots running substantially from the head to the foot of the mattress. Each divider may be selectively deployed by extending the divider bottom within one of the slots when separation of the bedmates is desired. The dividable mattress may also be used as an ordinary undivided mattress when the dividers are removed from their slots, and the slots are hidden by a flap which extends along the length of the slot and which may be secured to the top surface of the mattress with fastening material. When the dividers are not deployed, the dividable mattress looks substantially identical to an undivided mattress.