6am giggle fest

I wish I could understand (or explain) what is so funny at 6am. C wakes up every morning between 5:30 and 6 and laughs, sings, plays with dolls in her bed, etc until she wakes Z up. Z tell her to 'knock it off' and they both go back to sleep. Then I wake them up at 8:30 or so.

WTF?

Is this the universe telling me to get rid of my baby monitor? or is it C's public service to wake me up so I can get a jump on all the fun chores, like laundry and dishes before she gets around to getting out of bed.

Does anyone else's child do this? It's like an extended snooze button. Apparently when they stayed at G-ma's this weekend, she did the same thing. G-ma looked over at her and C said 'oh, I was just stretching and yawning, I'm going back to sleep' and she did.

And this is what they look like when I wake them up: