I've had many fish over the past 10 years, but NEVER have I had any that laid down to sleep!
I introduced a pair of clowns last week, and yesterday I thought they had expired, when I went to feed them on my way out the door to work. It was still dark, and I hadn't turned on any lights yet, when I found both clowns lying in divits aling the side glass of the aquarium! When I went to net my pets (AND my money) out to the trash, they woke up, asked for breakfast, and all is well!
I imediately started searching the web for answers, which brought me to you fine folks....and the rest, as they say, is history!
Fish in beds......go figger!