My midwife always stays an hour or two, but never wants something to eat. A glass of water is usually it, rarely a cup o tea. I find it a bit strange, actually.

if your house is ready an hour before, you have earnt your nap! nap away.
Mine never wanted anything either, usually a water. Then again half the time i forgot to offer! I said just say if you want a drink.
At the birth DH asked if they wanted anything and they just said they'd get something themselves and not to worry about them. Although at DS birth we provided dinner as she'd been there for awhile already and she needs to eat plus I hate eating in front of people if I haven't offered them.