See now I was thinking that if the sound of the splash didn't wake you, the water
Restraint would be bad in an emergency
... A friend of mine, who lives aboard a 50' stinkpot tied a metal pan and metal spoon to his leg so the noise
would wake him and he wasn't tied to anything solid "in case of emergency". He kept the line long enough and the pan safely tucked out of the way of his first step... he said it worked! Who knows!