We have two cats in our household, they are siblings, a boy and a girl from the same litter so there is a bit of a dominance issue. If they both cats decide to join me or my daughter in bed (say one by your head and the other at your feet or one on your left and one on your right, you know you are in for a bad migraine. At first we thought "Look how nice they are finally getting along" but then over time we noticed a pattern that they both always seemed to be there when we had the worst migraines.