Our bodies are not machine and when we don't take time to relax or rest, the body will demand it, but in a bad way. Prioritising self care is very necessary and essential to be able to be productive at the end of the day. Doing the same thing over and over again can cause burnout, this is why we need to practice incorporating some fun activities in between, most especially taking time to rest and sleep.
Even the machines we run day to day usually breaks down, crying for repair not to talk of human body