Naptime is hell time

Baby is 3 months old and getting him down to nap is literally hell on earth. He’s soooooo curious and stimulated by everything and anything which is AMAZING but it’s like his brain can’t relax and turn off for a second in order to nap. And, his naps are only 45 minutes long once he dies fall asleep.

I’ve tried everything I swear. I rock him before laying him down, pacifier, letting him suck his hands, white noise machine, no noise, closed curtain, open curtain, blanket, no blanket, letting him be bored in crib before window of napping opportunity, letting him nap once he’s completely exhausted. Nothing.

I’m exhausted.

Leap 3 already ended. Could this be a part of the 4-month sleep regression???