Well, during the week, Vivienne and I are up at 6am. To us, a "lie-in" means 7am, or <gasp> maybe 7:30am.
We've got cats, and anybody else who has 'em, knows what I mean.
Probably during the week we may sleep in until 6:30am or so, but I doubt it. Our considerate neighbor next door frequently puts the dog out before 6am and it sometimes barks.
We don't live in a house though, but in a strata townhouse.