C173 Waking up in time

I suddenly opened my eyes and found myself lying on the ground, while my son was lying next to me. He was staring at me blankly with his big eyes and his small mouth was slightly open, as if he was curious about why I was lying on the ground.

Fortunately, there was a carpet on the floor, so it wasn't too cold. I rubbed my head, then sat up in bed in a daze