Sooo tired!! Help!

My LO developed a sleeping pattern pretty early on. She usually goes down around 10pm gets up for a quick feed between 3-4am and sleeps again until sometime between 7-30-9:30am. Latley though she's either waking up every couple hours or if she does wake up at her normal time she wants to stay up and be silly. I try feeding her so she'll go back to sleep but she doesn't want to eat. She just wants to move around and make funny noises. Does anyone know why this is? Have/are any of you going through this? What has helped you? 
Thanks!