Currently up feeding my son a bottle..

I'm not sure why, but he woke up a little bit ago and just couldn't soothe himself back to sleep. I went in his room 5 times over the course of like 45mins to try to just give him back his pacifier, rub his belly, I even picked him up & rocked him (he fell back asleep with this but immediately woke up as I set him down). He doesn't normally do this..he's been sleeping 11-12hrs since he was like 3 months old...so I'm just confused?? I resorted to making him a bottle because I didn't know if maybe he was hungry? He ate 27oz today, and had a good almost 4hr wake window before bedtime. He did somewhat the same thing a couple other nights this week but was able to go back to sleep..what is going on? He is not sick or cutting any teeth.