Anyone have some sedatives to spare?

My kids have found a flood of excess energy the last couple of days. I have no idea where it came from, but I do know that I'm about to be driven insane by it.

It started yesterday on the way to church--Interstate's icy and slick, wife is reading me my sermon notes on the way to help me review, and the 4 and 5 year old are jumping all over the place and babbling at very high volume. (how they're jumping yet strapped into their booster seats I haven't figured out). All in all a fun time.

And they haven't calmed down yet . . . I've begged/commanded them to calm down several million times today and it works for about .5 seconds. Wit's End? That's about 5 yards to my left . . .