Bill Jensen, a fitness reporter and psychiatric technician shared his floating experience with SFGate:
When going into the chamber and closing off the outside world, my mind is free to wander without any stimuli beyond my own thoughts. I just let go and focus on how my body is floating like a raft on a river. There is a sense of comfort, and whatever aches and pains I have seem to disappear. Time seems to stand still as I escape worldly realities, however briefly, and before I know it ... the session has come to an end. I then go and shower off and dress before returning to face the "real" world again. I leave feeling rejuvenated and usually elated too, yet anxious to return. (Source)
If you're overly anxious, stressed, or just want a break from the real world -- try floating.