because ghosts arent real matter of fact nothing is real your concious is a bunch of chemicals your brain is a bunch of drugs working togeather to produce illusions we live in a simulation
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We don't even know if "ghosts" even really exist. A commonly accepted theory is that the energy left over from a deceased person can either disperse or stay together the latter case of course producing a "ghost". In religion it is mainly accepted that "ghosts" don't pass on because they are strongly emotionally attached to someone or something or they feel they still need to finish something, or are afraid of their judgement due to actions in their living life.
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Because you touch yourself at night