As soon as my chaperone duties were done with the last college final, fatigue hit me too. The past three days I have been on a roller-coaster of energy drops. On Wednesday I awoke full of energy and an hour later I was napping. I slept for 3 hours, woke up, and an hour later I slept again.
It is important to not let it get you down. You might need to ask for some help if your little ones need adult supervision.
The holidays hit at the same time most of the country is shifting seasons into winter. It is no better south of the equator where fellow MSers are shifting into the heat of summer. It is something most MSers go through. You need some "me time" to unwind. The stress from family, weather, etc. all combine to hit us heavily.
Stay strong and indulge in some guilt-free "me time".
