Google '9 month sleep regression'. Very normal, very common.
Babysleepsite is a good result, moxie is another. You'll see tons of results because it's a very typical developmental milestone.
That being said, you should find a ton of solutions on those websites, so even if it's normal, there are ways to help.
This is one regression my daughter skipped (thankfully since her 4 month one went all the way to 7 months). Some children will experience them, some won't.
SAHM to Magnolia May (09/10), Luke Russett (04/13) and expecting 11/16. Wife and best friend to my airman.