Baby forgot how to sleep??!

Ok so maybe he didn't forget but he certainly doesn't like it anymore. It was like as soon as he hit 5 weeks he didn't want to sleep! Restless naps here and there one good nap usually first thing in the morning but that's it. He used to sleep no problem he would yawn, we laid him in his bassinet and within a minute or two he was asleep. Now we try to lay him in his bassinet he screams!! Whaaaat gives?! Will I get my easy going baby back or is this our new reality? I slept in the bathroom last night with the water running it was the only way he would rest at all.. help?