I'm not sure if I'm being serious, but this is the most he's slept in awhile (nights included). I don't even know what to do with myself when I'm not feeding or calming him!
Do you think the car seat is a cozier fit for him? Maybe you could wrap up two small blankets and wedge them in between his body and the side of the RNP to make him feel snugger?
My son slept in a swing for 8 months but I never let him sleep in the seat if the car wasn't moving. He fell asleep in the bouncy seat once and his head came forward right away.
I was getting up every 2-3 hours then, it just became normal. Then at 5 weeks she started to sleep for longer bouts, up to 7 hours a couple of times.
Then at 14-15 weeks everything changed and I haven't had more than 3 hours straight sleep in over a month. And now I am back at work. It's loads of fun.
She sleeps well in the car too but not any better than anywhere else really, maybe for a bit longer but not enough to outweigh the risks.