Heavy Sleeper/Early Riser

Brittany

So lately our 11 month old has woken up very early, like 545/6am when usually she sleeps until 7/730.

Her first nap is usually at 930 but I've been putting her down at 9 cause shes so tired. And shes been sleeping 2.5-3 hours! This is abnormal as shes usually 1-1.5 hours.

Any thoughts on what's going on?