Self: There are lots of reasons why someone might need to sleep separately from their partner, but more research is needed to examine how sleeping separately impacts overall mental and physical health.
If one of you works late nights, then sleeping together could involve 3 a.m. disruptions. One of you might have a sleep disorder that makes sleeping in the same bed unpleasant or even unsafe. It’s also possible that you and your partner started sleeping separately for some reason during this pandemic and you discovered that you enjoy the extra bed space.
If you want concrete proof that sleep divorces are useful overall, there hasn’t been much research on the matter (sorry). But it’s clear that some of the issues that might prompt a sleep divorce can definitely be harmful to your rest. For instance, a literature review published in 2016 in Chronobiology International found some evidence that sleeping with someone who snores can have a negative impact on your own sleep quality.