8 week old suddenly sleeping a lot?

My 8 week old son usually sticks to a schedule of nursing, being awake for some play time and then napping anywhere from 30 minutes-2 hours during the day and eats every 3 hours. Today he suddenly just wants to sleep all day? He slept the same amount last night as he usually does so I’m not sure why the change. Any other moms notice a change around this time? I’m letting him sleep and just waking him to eat. Usually nap times are a battle but I can hardly keep him awake now.