Abstract: A mattress tilting assembly having upper and lower support frames. The upper support frame is designed to carry a conventional box-spring and mattress and is pivoted to the lower support frame so that the head portion of the mattress is raised higher than the foot portion. Lock means are positioned between the upper and lower frames for providing stability when the upper frame is in a raised position. The lock means includes at least one brace member pivoted to the upper frame and having a nose portion disposable within and passing through a slot located in the lower frame for securely holding the upper frame in raised position. Means are also provided so that the frame members may be adjusted to accommodate mattresses of different widths.