It would be a good time to self evaluate as to why you are feeling burnt out.
Usually if it is a work related stress then best take a few days off (Provided you have the option) and completely forget about your work. And I really mean it when I say completely forget. People tend to keep tabs on work even when they are on a time off which defeats the purpose.
On the other hand if you feel the issue is not related to work but something more i.e. something like toxic work environment, emotional distress, personal reasons etc then try to be open to the fact that it might be time to move on from the job or reprioritise things.
Ultimately it is your mind telling you that something needs to change and only you can answer what it is.