# When You Stay Up Late…

If you stay up late for New Year’s Eve tonight, by tomorrow you might feel pretty sleepy — and yawn more than usual. The funny thing is that yawning seems to be contagious: when one person yawns, other people nearby yawn, too! You can even get your dog to yawn by yawning in front of her. Of course, if she stayed up for New Year’s, she’s probably sleepy, too.

Wee ones: The average yawn lasts 6 seconds. Can you count from 1 to 6?

Little kids: If you yawn and that makes 7 other people yawn, how many of you have yawned in total?  Bonus: If you normally sleep 10 hours, but tonight you sleep only from 2 am until 8 am, how much less will you sleep than usual?

Big kids: If you yawn 5 times in one day with each lasting 6 seconds, how many seconds do you yawn in total?  Bonus: Say you’re with 24 other kids. You yawn, and within 5 minutes, half of the other kids yawn. Within 5 minutes after that, half of the kids who are left have yawned. How many kids still haven’t yawned?