The first couple of days I thought ( admittedly with some relief ) that I was ragging : it 's okay to feel like your world is collapsing when you have PMS . But it kept happening , every day , even after her sleeping pattern improved . Finally on Friday night I was awakened at 2 am with a bad bout of cramps that felt for the world like labor pains .

Give answer the following question using evidence from the above passage: Why is the narrator displaying more signs of grouchiness ?
None of the above choices .