I also have the same query. I have a hedgehog house which I think is being used. I’ve seen our hedgehog a couple of times, and presume it is sleeping in the box. I also have a “diner” – a plastic box for the hedgehog to go inside to eat. I put new hay in the house when I first put the house out – about 2 months ago. I’m not sure when to look inside as I don’t want to frighten the hedgehog. I too wonder whether I should replace the hay. If the hedgehog is sleeping in it during the daytime, when is it advisable to look inside. The house I have was from Ark and has lid over the whole house.
Any advice will be appreciated.