Falling asleep during your float is a desired effect. One hour of sleep during flotation is equivalent to 4 hours of a sound sleep during the night. The high concentration of pharmaceutical grade Epsom salt (approx 1,000 lbs) in every flotation cabin, naturally causes the body to remain afloat, much like a cork, making it virtually impossible to sink or to turn over if you sleep. Therefore, there is no need to worry about the risk of drowning. And, knowing how to swim is not a per-requisite for floating, as all you have to be able to do is lie back, and the salt water will take care of the rest.