Burnout can be surprisingly hard to recognise. If you've not taken a holiday in a long time, that's a risk factor. And demotivation, like the sort you've descri

Burnout can be surprisingly hard to recognise. If you've not taken a holiday in a long time, that's a risk factor. And demotivation, like the sort you've described, is a common symptom. If you can, you should really try to take a holiday. Does your university allow you to take a semester off? Do you have funds to cope with time off? If you can, I'd do just that. If you can't, what about taking a few weeks off informally?