Don't have to be child related.
9 weeks in with my little girl and I roll my eyes at anyone who says "sleep when she sleeps" - honestly, first two weeks, fair enough, but now DH is back to work, there's shit to be done. I'm not even talking about big jobs, just your bog standard pot washing and bottle sterilizing. Plus, she only sleeps for 30 min or so stints during the day, so if only just be drifting off as she woke up.
On the flip side, someone told me you could crush an Oxo cube up in it's wrapper then tear the corner off to sprinkle in food, and it changed my life 