A mattress lift for elevating a bed mattress and tucking in sheets or bed covers beneath or under the bed mattress between the bed mattress and a box spring or other supporting surface comprising a lift device including a base or body having a longitudinally disposed substantially oblong recess formed in the upper surface thereof with a longitudinally disposed oblong slot formed in the base or body symmetrically disposed within the longitudinally disposed substantially oblong recess, a lift handle formed or coupled to a proximal portion of the base or body configured to be grasped by the user, a lift ramp including an inclined surface formed or coupled to a distal portion of the base or body configured to slide between the bed mattress and box spring to tuck the sheets or bed covers therebetween and a lift support device including an upper lift coupler movably or slidably disposed within the longitudinally disposed substantially oblong recess interconnected or coupled to a lower lift support member disposed beneath the base or body by an interconnecting member at least partially disposed within the longitudinally disposed oblong slot movable or slidable from the proximal end of the longitudinally disposed oblong slot to a distal end of the longitudinally disposed substantially oblong slot to support the lift device in an elevated position to hold the side edge portion and end edge portion of the bed mattress in spaced relationship relative to box spring or support.