I should be sleeping

So Jill, the mom of the family I nanny for had back surgery this morning and I had to be there bright and early to get the kids up and off to school. So I was going strong from 6:35-12:45 when I finally took a break and fell asleep in their spare bedroom. I was so exhausted that I let my nap go longer than the advised 20 minute power nap and was awakened an hour later by the oldest getting home from school. Well the nap felt wonderful and I am happy I got it, except that I have to be back their tomorrow at about the same time and I can't fall asleep! This week I am going to be really feeling it... with about twelve hour days every day, especially Thursday and Friday because the youngest (also the most attention hungry) doesn't have school so I won't get time off in the middle of the day, because he's the only one of the three that can't be left home alone AT ALL! I might have to request that Dave get home from work a little early. I don't know if I can handle it!