Shots Question (3 month)

DS had his 3 month shots on Sat.
Yesterday he was great, cat napped and was in bed by 9:30, slept through until 6:45 this AM.
Went back to sleep around 9:30 woke up for a bottle around 10:15 and by 11AM back to sleep. Still sleeping.
Is it possible the shots are still affecting him a bit? making him so tired?
TIA

Re: Shots Question (3 month)

i think it is about normal..
DD slept heavily after her shots