At almost a year, with a baby who has never slept more than 4/5 hrs (and more commonly 2hrs at a time) I second about removing expectations.
Also baby sleep isn't linear - it doesn't get better and then necessarily stay that way. We've had better spells and worse spells. LO has 8 teeth already and has had a cold pretty much for 4 months solid. This can knacker their sleep. And why wouldn't it - they are in pain or feeling poorly so of course they need you in the night.
I'm a big believer too in remembering that babies have emotional needs 24/7 so just because they are only feeding for comfort through the night doesn't mean that it's a need that doesn't need to be met IYSWIM.
I have also met lots of parents who did exactly the same thing with their babies and would have one who slept and one who didn't, this to me makes me think a lot if it is inherently down to a babies make up whether they are sleepers are not.
As for coping - coffee, snacks, fresh air and a 'good enough' approach to cleaning, cooking, personal appearance etc. Co-sleeping if it works for your family.
It's really tough, I woke about every two hours when pregnant too so I'm at about 20 months of never sleeping more than 4 hrs at a time. I just keep telling myself it will get better.