Why do people become so cuddly when they feel tired? I'm guilty of this as well?

Anonymous
I am not a touchy person and never have been but whenever I start to become really tired around my best friend we just start getting really cuddly and sometimes fall asleep together. For example I was in and out of consciousness when I was watching TV with her and she was just as tired. Its weird she fell asleep on top of my shoulder and I just rubbed her back and she rubbed my chest and we fell asleep. It happens a lot and we don't like each other but we just get so I don't know mushy lol when were tired.
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Why do people become so cuddly when they feel tired? I'm guilty of this as well?
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