neglect and pony tails
To be honest, I truly think it differs depending on the person. For me personally, my hair blew up with knots the same time I started having to wear my hair up for work (around the 11month mark). My hair always got really tangled while it was up anyway, for some reason. I didn't worry about the tightness or anything either, I just pulled up as tight as it needed to be to stay in place and even used lots of hair clips to tame fly away loops on the side of my head.