Why is sleep so tricky?!

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My baby will sleep through the night but CANNOT sleep longer than 45 min during the day.... it’s so frustrating! We have tried everything... CIO for naps, changing wake window times, doing a long wind down, feeding closer to nap time, we have a routine, dark room, white noise, sleep sack, same environment as night.... and when he wakes up I let him hang out in his crib until he cries in case he will go back to sleep. I’m sooo ready for these naps to consolidate 😣😣 okay vent over 🙈 but if you have anything that you have done that worked or helped please share!!!