It's the way it goes.
Though one has learned the art of urination and defecation expulsion, without the need for jacket removal.
Nonetheless the latter does require a certain level of fabric clearance from the exit port.
I dare say that women operate on a similar level when dressed...Though the former perhaps requires a certain level of clearance activity to avoid ongoing dampness, odour and discomfort...Am I correct?
I do take my jacket off in bed, when sleep is the objective.