Disclosed herein are apparatuses for supporting a person in an upright position while sleeping or resting in a bed such that the person can avoid sliding down into a horizontal position as a result of natural forces of gravity and normal movement during sleep. According to an aspect, an apparatus includes a harness configured to hold a person, an anchor to secure the harness to a bed, and a tether having one end connected to the harness and another end connected to the anchor. The anchor can include a support member and an insert extending from the support member such that the upper surface of the insert comes into contact with a mattress and the lower surface of the insert comes into contact with a bed-base. The insert can be positioned underneath the mattress and on top of the bed-base.