Out of nowhere last night, my LO wakes up and becomes hysterical when I try to nurse him back down. Was upset when I offered the boob, continued to cry hysterically, only thing that would calm him down was bouncing on the ball (he's 8 months and I had to pull the thing out of the garage!!). Did this ALL night long with brief periods of sleep. I knew he was in the middle of a leap, but in the middle of the night I pulled up the WonderWeeks app and saw that starting yesterday there was a big storm cloud noting that this week might be a very fussy period. This type of thing has happened to me on a few different occasions. I just can't believe how accurate the WonderWeeks chart is for my LO!! Has this been the case for you?