PSA: DO NOT keep turning the button when it feels tight/like you can't tighten it anymore. If the hair is that loose, the eyelet will be against the back wall of the mortise in the stick, and if you keep tightening, bad things can happen.
Best case scenario: the button pops off the screw and you need a bow maker to put it back.
Worst case scenario: you crack the end of the stick and need some serious repairs.
Chances are one overnight shouldn't be too much of a problem, and if anything, you need a rehair because the hair is long. If bows are left tightened for a long period of time, or heated (say, left on a radiator or in a hot car) the camber can be altered. If it doesn't get better in a day or so, take it to a shop and see if they recommend a rehair or some more camber.