Becca, is there any fun project you can set them to doing? You've got what--2 hrs? Can you let them make cookies?

Alternatively, manicminer's headphone idea (if you have them & the kids would leave you alone) is great. Envision an all-white room & lose yourself in it. hold a mental candle in your mind & watch the flame. Count to a million. Play games on PC. Stay online with manicminer & whomever's hanging out there!

Any of these work for you?