Do they know it's saturday?

I swear my kids know it is the weekend and get up extra early because it is. tomorrow is mother's day and the only thing I've asked for is to sleep in. I just know they will decide to sleep in tomorrow as well...little buggers. I'm sooo tired and I cannot shake this headache I've had for a few days. I had some dental work done on tuesday and I'm pretty sure that is what caused it...an adjustment helped on wednesday but I had no time to go again yesterday. Uggh.