DD1 is 4 1/2 and had just her MMR booster on wednesday. SInce htat night, she has been waking up to 6 times a night, shouting and crying for us. She claims not to know she is doing this and we think she really doesn't. Do you think it is just coincidence or can poor sleep be a side effect of this vaccine? She was fine with her first one that she had at 22mo.