Sleepiness after shots

Me

My little guy had his shots yesterday and did great! I think his dad and myself had a harder time! He was super fussy after his shots for a couple hours and then slept from 10-4. He woke to eat and hangout for a bit, and then went back down around 6. He woke back up around 9 and went back down around 11:30 and has been asleep since. (It’s 2:30 my time)

Is he sleeping too much?? I feel like I should wake him and keep him up and active but he just falls back asleep after eating and hanging out for about 45 minutes. He’s usually awake for most of the day with just a 2-3 hour nap.