It's more of a casserole, with the bread angled into a baking dish like shingles. Then you mix your egg/cream/sugar/spices/nuts - whatever kind of custard you want your bread to be bathed in. Assemble at night, cover with plastic film or aluminum foil, and pop into the refrigerator. In the morning, take it out of the fridge and pre-heat the oven while you perform your morning routine, then bake it for about half an hour or so. Once done, cut pieces out of the serving dish, top however you want it (powdered sugar, a syrup of some type, a warm fruit compote, fresh berries and whipped cream...the options are limitless), and enjoy. It is very rich, but it keeps well. You can portion-control it for a few days, if you're a strong person.
I've done a mash-up of several recipes when I've made it. I'll try to compose something lucid later and start a thread. Right now I have to get to the grocery store if we're to have my intended meal for supper.