Ok- maybe this is a dumb question, but how do you get newborns to nap?

Up until the last few days my little one fell asleep whenever, wherever, and seemed to get enough sleep. The last few says he is wide awake most of the day and then very fussy... probably from being overtired. I’ve read a lot that they should only be awake 45-120 minutes, but nothing says how exactly to get them to nap if they are wide awake.

I’ve tried rocking him, feeding him, laying him in his bassinet... still bright eyed.