no alarm=earlier wake up?

why does every saturday and sunday come and my kids are up at the crack of dawn, crabbing at us. or so it seems. Seriously this week paisley slept until 7 a.m. everyday and we had to wake griffin almost everyday to get ready for the day....one day he even slept until 8:15 on his own. TODAY? 6 a.m. crying for baby girl and shortly after for griffin....ugh. sleepy. and Lee is crabby. can I run away now?