Normal?

My son turned five months yesterday and has been sleeping so much today. Last night he slept from about 9 o’clock until five this morning and then at daycare today he slept six hours (waking up to eat in between one time) I know babies have growth spurts but he’s never slept this long even during his growth spurts. Is this OK or something I should contact the pediatrician about? He’s also has a stuffy nose and we took him in for that last week and was told it’s probably just a little bug as long as he don’t have a fever it’s fine.