As astronauts who've been abandoned by their ships in deep space can attest, there are few experiences as relaxing as floating through total darkness in zero gravity. Today's deal treats you to the closest earthbound equivalent: for $20, you get a 90-minute float at FloatOn (a $40 value).

The idea behind a FloatOn flotation session is pretty simple. A tank is filled with a layer of warm water that has been supersaturated with Epsom salt. The salt makes the water denser than the human body, allowing you to float weightlessly on its surface while the senses of sight, sound, touch, and gravity are effectively eliminated. FloatOn offers two varieties of tank, known as Ocean Float Rooms and smaller Space Pods; the former are tall enough that a person can step into them upright before he or she reclines. Stress melts away, pains and muscle aches subside, and the mind can become as calm as a polished mirror. Other physical and mental benefits, including reduction of stress, increased inner awareness, and spontaneous bouts of whistling. FloatOn offers complimentary teas to soothe away saltiness and reinitiate senses into the world of stimuli.