sleep questions

Kim&Jim

This seems like a popular topic on the boards!

My kids are almost 8 months old now.  They were doing great STTN.  They would usually wake up around 7 - 7:30 and just play until 8:30 or so in their cribs.  For the past week or so, Keegan has been getting up at 6:45 and just crying and not falling back asleep.  He looks tired, but doesn't want to sleep.  Is there a 7/8 month sleep change that I don't know about???  I don't know if he's teething or not (has 2 on the bottom showing and none that I can feel on the top) and I don't want to medicate him if he doesn't need it.

Thoughts??

Thanks!