How do you know when your kids have consumed too much Halloween Candy?

Radu was getting Jhanna ready for bed on Halloween night. All the sudden I heard her running up and down the hall. "Wahoo!!" She continues running and jumping. "I'm going to sleep in my panties." It took us a while to get the kids subdued enough to go to sleep. Luckily, Halloween only comes around once a year. The girls got a fair share of candy. I can now spent the next few months fighting with them about how much candy they are allowed to consume at one time. Natasha is catching on. She informed me the other day that the candy is HERS not mine. I'm not trying to eat it. I just want to ration how much they eat.