6 week old sleeping 2 hours at a time at night

I'm sure this probably is pretty normal, but my 6 week old only sleeps 2 hours at a time all night. He eats every 2 hours all day long about 2-3.5 ounces formula fed. I feed on demand. He sleeps decent which I am very thankful for. When he wakes up at night it's change, feed and right back to sleep. But this process takes 30 minutes. Then by the time I go back to sleep I only get to sleep an hour at a time. My husband works 3rds so I'm doing this all by myself. I am just starting to lose my mind from lack of sleep. I cant feed him more because he just refuses to eat when he's done. Seaddle, no swaddle, noise, no noise, by me, not by me, it just doesnt matter. He will wake up to eat every 2 hours. Is there any way to get even a little bit longer stretch of sleep?