An adjustable side rail assembly includes a side rail and an actuation assembly. The side rail is rotatable between a storage position and a use position. The actuation assembly includes an inner member, an outer member, and a locking assembly. The outer member is coupled to the side rail and is rotatable relative to the inner member between first and second rotational orientations for rotating the side rail between the storage and use positions, respectively. The locking assembly is transitional between a locked condition, wherein the locking assembly engages both the inner and outer members to fix the inner and outer members in the first or second rotational orientation, and an unlocked condition, wherein the locking assembly is disengaged from the inner and/or outer member to permit rotation of the outer member relative to the inner member between the first and second rotational orientations.