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Hi! I'm CalCatDoc and I can help with your question.
And unlike the automated response you got a minute ago, I am actually a live human being typing here, and am a veterinarian.
Are you available to answer a few questions about Tipper to help me get started figuring this out?
Has he always done this?
How old was he when you got him?
Is he Siamese or part Siamese?
Sorry, had to be AFK for a couple of minutes.
Does he lay there purring and drooling while is sucking on your hair? Or is he standing up and yanking at it and bopping your head?
This behavior can be either a retained kitten behavior that is displaced nursing activity, in which case you can gently discourage it, but it's not necessary a bad thing he has to stop. It can also be a type of play behavior that, especially if it happens at night, is not something you want him doing since it will likely get worse over time. You can be more firm in discouraging nighttime play behavior.
I've had a couple of cats that did this and I suspect both of them were weaned too young and hung onto the nursing behavior as form of self-comfort. And I currently have a former bottle baby who sucks/nurses on his own tail (with its long fur), though he does not chew the fur. I let him do it since it doesn't affect me directly.
You can respond when you get back and the system will (hopefully) alert me. If you have additional questions or need clarification, please let me know.