In the float tank, part of the way through I could hear some noise. As I had the earplugs in, I assumed it was the music starting for the finish, but it wasn't clear. I removed the ear plugs and could hear talking and laughing, I assume from the treatment room next door. I had no idea how much time I had left on my float (a small unlit clock would be useful), and so couldn't relax again - and I could still hear the conversation anyway.
The rest of the experience was fine.