I know indoor cats sleep 18 or so hours a day, and Waffle seems to sleep just as much! What is the average number of sleep hours for a healthy corgi? He sleeps a lot and I want to be sure it isn't out of boredom. It's been hot recently (90 degrees at 11 PM) and I can't exercise him the way I want to. I still play with him inside, but that's not very tiring. With all his sleeping, I've just begun to wonder how long they're supposed to sleep!