Advise on sleeping issue

My 9 week old naps wonderfully during the day. He naps for nearly 1 hour exactly 4x a day. I use the Huckleberry app to track his info & put him down at the suggested times. My problem is with his night sleep. He is difficult to put down (same routine at same time every day), and will fuss (not quite cry) for about an hour after. He will sleep for one 3 hour stretch, usually 9-12, and then wakes up every hour until 8am. I'm exhausted. I dont expect him to magically sleep through the night, but anything longer than an hour would be nice. Any tips from those of you with similar age kids sleeping decently?

He cosleeps in a crib attached to our bed. EBF. He feeds 8-10 times during the day between 7am-9pm.