Are any other toddlers waking up super early lately? For the last couple of weeks Moo has gone from sleeping til 7am, sometimes 7:30am to waking up anywhere between 5am to 6am

His bedtime hasn't changed so I'm at a bit of a loss as to what to do about it. I've tried patting him back to sleep but as soon as I leave the room he wakes up & starts crying hysterically again. I'm pretty sure he's not actually ready to get up for the day as he starts crying right away, but I can't get him back to sleep unless I want to sit in there the whole time. DH has actually laid down on his floor & gone to sleep the last few mornings! That works but obviously it's not a long term fix.

He has never liked sleeping in our bed so that's not an option, he seriously hates it.
Any ideas?