How is my LO still awake he’s 5 months and it’s been like 20 hours and he’s maybe napped a total of…

How is my LO still awake he’s 5 months and it’s been like 20 hours and he’s maybe napped a total of 30 mins after he woke up at 4am it’s the total opposite of him, he’s always slept like a rock all night and napped a lot during the day . Mommy’s tired 😭 and I know he is too but he just can’t seem to sleep more than 10mins at a time. (No pain, screaming or crying ) just clingy.