If you’re writing up your thesis, you can take a day off.
If your viva is soon, you can take a day off.
If your viva is done and you’re working on corrections, you can take a day off.
Rest and relaxation is required, not a nice little bonus if you get around to it.
What you’re doing is important.
So take a day off.
#takebreaksmakebreakthroughs (with thanks to Dr Kay Guccione!)