A common sexual practice.
This involves taking naps between acts of sexual intercourse in order to recover and gain an energy boost for the next session. Couples may drift between sleeping and sexual intercourse numerous times with no verbal communication or other activities outside of the bedroom.
This is probably the most productive way a couple could spend a sunday. I.e. in bed and fucking.
Joe: How was your weekend man?
Peter: Pretty mad... spent all of Saturday and Sunday cat napping with the missus.
Joe: Awesome... wish I had a cat........