Are they less social because they desire less social interaction, or are they less social because when they're awake they're around fewer people. Possibly criti

Are they less social because they desire less social interaction, or are they less social because when they're awake they're around fewer people. Possibly critical distinction there. Speaking for myself, I pretty much don't want to communicate with other people before 3 PM, however I'll happily stay up til 6 AM socializing with friends.