7 month old changes ???

So my baby is 7 1/2 months old and i feel like she’s changing a lot in regards to her personality, attitude, sleep etc .. she has always been a good calm baby. Never crying,fussy or not sleeping well. For the past couple weeks she’s been cranky, she gets mad if she doesn’t get her way, if she wants to get out of her car seat or high chair she will throw herself back and hit her head until I get her out, she fights her sleep specially at night time. She used to go to bed by 9-10pm now it’s 12-1am. Thankfully she doesn’t wake up until I get up for work at 6:30am but she has been work these past weeks. I’m tired and feeling stressed. Has anyone seen changes in their babies too? Is this normal????

Is this what they call sleep regression?