I've been dealing with this some myself. It really sucks. I felt so guilty because in the grand scheme of things, I'm doing great, but at work, I couldn't bring myself to do the most trivial things I'd done countless times. Thankfully, I came across this article which has been helpful in setting me on the right track. https://apple.news/AIRTKZkBFQBmDhsIAImifTw

TL;DR - Occupational Burnout is a result of the body's inability to respond to cortisol (stress hormone) in the work environment. Sleep, vacationing & working out are a prerequisite, but insufficient to correct. The article instead recommends that people should address major contributing factors that show up most commonly:

1. workload

2. autonomy

3. fairness

4. reward: comp + recognition

5. workplace community

6. purpose: values + meaning

^ In my case, I took a hard look at each one and have been making sure I focus on addressing those that seem to be most demotivating to me. Creating a physical work environment and reading about the behavioral science of habbit forming has also been great support.

Best of luck in getting through it. You're not alone!