Itsy probably a valuable adaptation tool. When my son was born in went from 8-9 a night to 4-5 for a few months. At a certain point it started feeling like I adapted. I wasn't really miserable. I wasn't dragging myself through the day anymore.

Then when my sleep went back up as my son got older, I had that moment of, "holy crap I forgot what rested felt like. This is amazing. I actually want to go for a pointless walk!"