What do Americans call a "lie-in"?

The Random House dictionary gives the main definition of "lie-in" as:

a protest demonstration in which participants lie down in a public place against regulations and resist being moved.

The definition I'm more familiar with, given second, is:

an act or instance of staying in bed longer than usual, especially in the morning.

This is marked as "chiefly British". So what's the American equivalent? Or do Americans still use "lie-in"... would they understand the "bed" meaning of the term?

Solution 1:

Within my (American) experience, "have a lie-in" is not used in the US. Instead, one would use "sleep late".