What an amazing experience! We humans are never without external stimulation and this completely takes away the constant barrage of information, sights and sounds. I did a 60 minute float and the first few minutes were a little strange, but then I turned off the lights and the music and it was easier to relax. I left the lid open. It was the perfect combo. I will definitely do this again and I'm referring all my friends. It's a great way to take your mind off everything and truly relax. Thank you, Denise!