But, as often as not, they prefer to climb on top of the house for a snooze, rather than getting inside it. The house then usually collapses under their weight, which just makes it an even more comfortable spot to snooze.
This always reminds me of Snoopy in the Peanuts comics, sleeping on his dog house.
The F litter kittens will be six weeks old tomorrow.
I took this photo three days earlier on 7 February. It was at night, in poor light, but you can see the same two kittens, with Freya peeking out as Foster stands on the roof!