BABY ADVICE NEEDED

Im a first time mom of a 10 month baby. He’s slept through the night and consistently had 3 naps a day since 4 months old. Last night for no apparent reason he didn’t go to bed until 10:30pm. I figured that he would just end up sleeping in and I didn’t know why it had happened, but at 2:30am he was wide awake crying wanting me to get him out of the crib. So he was up since 2:30 AM and I figured he would take his first nap early…BUT he didn’t even take a nap at his normal morning nap time. And then he didn’t take his second or third bel either… no sleep at all the entire freaking day. Now it’s 6:30pm and I have a child who has been up since 2:30am. He’s been very fussy but he’s eaten, no fever, breathing normally, head to toe looks fine. Can this be a sleep regression? (He’s never had one). Something else? There doesn’t seem to be anything wrong with him but I’m worried! it’s just bizarre he had a 4 hr night followed by a day of no naps. Any advice or thoughts appreciated.

Edit - So it sounds like you guys think it’s a sleep regression. Thanks for the feedback! He never had one before so I didn’t know what to expect. I sure hope it doesn’t last long bc today has not been fun!!