For the source text click/tap here: Bava Kamma 86
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According to the Mishna on our daf, the obligation of boshet only takes effect if it was done with the intention of embarrassing, and it remains in force, even if the person who is embarrassed is naked or sleeping.
A baraita brought by the Gemara points out that although there is an obligation to pay boshet even if the person is naked, the amount that he will have to pay is based on the level of embarrassment, and we can assume that the embarrassment will be less for someone who was already naked than someone who was fully clothed.
We struggle with the compensation fo humiliation and its parameters.