"Do you really think an 8 month old still gets hungry in the night?"
Sometimes I wake up hungry in the night. I'm 30 years old.
You could try what runnyhabit says, increase his food intake during the day, maybe try one or two more bfs too, as this is the ultra-high calorie stuff.
You could try a "dream feed". Basically, just before you're ready to go to bed for the night, you feed baby. Don't try and wake him if he's in a really deep (no movement) sleep. Wait until he's in a light sleep (twitching, moving around, rapid eye movement etc) and then pick him up & put him to the boob. Use breast compression if you need to keep him awake longer to feed. Then go to bed yourself and it should be longer before baby wakes again needing milk.
You could try moving the cot back into your room, or getting dh to get up and bring baby to you for feeds and take baby back, that way you share the burden of the night waking. Or you could try bed sharing (works a dream for me).
Are you still on maternity leave? If so a daytime nap might help alleviate some of your tiredness.