Mama, I'd really encourage you to check with your pediatrician about this, sleeping way more than usual can sometimes signal something na kailangan i-check, so it's best to get professional eyes on your son talaga.
A few of us mums notice our toddlers sleep more when they're fighting off something or if they're not feeling well, so don't wait if something feels off sa tummy mo. Your doc will give you peace of mind, promise! Hang in there, mama.