Illness and physiological issues are obviously an exception, no?
One would think, except managers don’t care. If you can’t fully recover in a couple of weeks they start looking for reasons to get rid of you.
You learn to hide symptoms as best as possible. Be antisocial on bad days so people Don’t notice how much your struggling.
Laying down 20-40 minutes is enough to be effective in the afternoon.
My choices are work from home and a daily “long lunch” or be homeless.