Sleep

Why do kids decide all of a sudden they're not going to sleep?  Surely they're tired.  Jacob has had major issues with his midday nap for like the last two weeks.  He won't go down without a fight, then once he does fall asleep, we wakes up crying once or twice in the middle, is tired the rest of the day, and fights bedtime, too.  Jordan is good about going down, but she's been waking up with nightmares at around 11 pm or so, and has decided her day must start at 6 am.  The time change has made this all worse, but it started before then.  I hate to think that my kids are stressed out.  I know that's what ruins my sleep.  We have a quiet November planned; hopefully we all get back on track soon.