Papa, Is Mama a Light Sleeper or a Dark Sleeper?

Mama is a light sleeper; Papa's in the dark.
Or, Papa is the light sleeper, with his eyeshades pulled
Against Mama's reading lamp. She reads in the dark.

Or, you are the light sleeper that we hover near,
Your fitful, imperfect parent lamps, small circles
Of glowing footprints echoing down through the dark.