Such "Divas"! Haha, take care. :)
This Water Flotation Tank seems an incredible experience. But don't you feel your heart beat, and everything that is happening in your body? Must be relaxing but strange. :)
And these "brain waves" thing glasses look so funky. You should wear them at parties (But you would fall asleep on the dancefloor) ^^
It's possible that you can hear your heart beat. For me the experience only really began to be interesting when I put on the earplugs but that only happened for the last 10 minutes.
I may try that one day, I'll take the earplugs advice. But I'm not sure if I can find one of these Tank in Switzerland. I'll check that! Cheers!