Did my baby have a seizure? What do I do? Should I be worried?

Last night, we were playing with my 8 1/2 month old on the bed. After a little while, he wanted to be picked up to start laying down. So I laid him on me and he just looked around the room. Then all of a sudden, he had his head up but his eyes started rolling back and then he started staring off into the far side of the room. For probably about 20-30 seconds, neither my SO or I could get him to respond to us calling his name, tickling him, moving him around. Afterwards, he seemed to snap back into it and acted fine. My SO thought he was just over tired since it was around the time he usually goes to bed, so he made him a bottle and laid him down. I didn’t even think about the possibility of a seizure until I was reading about absence seizures this morning. He slept for half an hour and then woke up seeming very startled but looked exhausted. So I gave him the rest of the bottle my SO made and laid him back down. Then he slept for a long time, which isn’t like him, usually he wakes up at least 3 times a night. He only woke up once. Then when he woke up for the day, he didn’t cry to eat like he usually does, and he had went a long time without a bottle. I made him one just in case and he gulped it down really fast. Usually he also cries to be picked up but he hasn’t done that either. He’s still responsive to his name and seems fine except he just isn’t crying, which is unusual for him. Usually he is VERYY vocal.