The USP is that it helps you fall asleep on the water? I can't think of a single waterway in the UK where it would be safe to fall asleep. Maybe in a paddling pool in your back garden, although a fall in your sleep into shallow water could still put a crimp in your day.
Didn't first appear on webland on April 1st did it?
Falling in in Wyoming USA most of the year wouldn't be much fun either. Most of that water comes from melting snow.