Hi,
I've got hedgehogs in my garden, in fact, I bought a wooden house for them to live in. They are free to leave the garden but seem to prefer living in their 'hog-cabin'. I put about 1" of sawdust in the bottom and then filled it up with dead leaves and they made a hollow to sleep in. So I don't disturb them I only look in there once or twice a year, just to clean out the old bedding and put fresh in - as they don't like being disturbed.
I feed mine special dry crunchy biscuits made for hedgehogs called 'Spike's Dinner" - a bit like cat munchies. I've built a little brick igloo to put a saucer of these munchies in every night (so cats can't eat them!). And of course a couple of bowls of water for them.
I know I sound mad!!!! But honestly I'm the most normal person you'd meet LOL.
Hedgehogs must never have milk, or fishy cat foods, or bread.
:)