a platform structure 26 rotatably coupled to the first support structure 24 at a primary pivot 28 the platform structure 26 is for substantially supporting the mattress 22 thereon and is displaceable between a lowered position 30 and a raised position 32 the mattress 22 is preferably substantially horizontal and substantially vertical when the platform structure 26 is in the lowered position 30 and the raised position 32 respectively when the positioning assembly 20 is in use the platform structure 26 is displaced to the lowered position 30 to avail use of the mattress 22 and to the raised position 32 for freeing up space when use of the mattress 22 is not required preferably the mattress 22 rests on a bed frame 34 shaped and dimensioned for accommodating the mattress 22 the bed frame 34 is coupled to the platform structure 26 to enable the mattress 22 to be supported thereon the platform structure 26 has a first end 36 and a second end 38 forming extremities thereof the primary pivot 28 is configured between the first end 36 and the second end 38 of the platform structure 26 the positioning assembly 20 further comprises an actuator 40 extending between the first support structure.