Element yes I did think it was sex you were referring to in general. The 1st person is a distant memory when I was 15. The last person, the Doc and yes it was sleep we have three (3) kids in the house.
That was my first thought, then I rethought it (which is why I didn't answer the "first person" question, I couldn't better Welby's answer). Last person answer stands, I share a bed with her - and most nights all we do in it is sleep.