If you’re thinking about trying out floating for the first time, be aware that it's nearly impossible to drown. Since the water only goes 10 inches deep and has a very high density of salt which makes people buoyant regardless of their size or weight - if anything, this increased our chance at survival because we could support ourselves with just one arm! Rolling over also requires conscious effort, unlike in bed, where gravity does most work turning onto ones stomach. This would require more energy than usual before falling asleep. You will not feel unsafe anytime during the 60-90 minute float, especially since the saltwater would immediately wake you up. One hour of floating could be equivalent to 4 hours of sleep in terms of cortisol consumption.