Hello, Mairi Clare!
Your lo sounds like my lo! DS also wakes for his dream feeding most nights. (He's just over 6 months, and he's been doing this since he was about 4 months old.) I don't know if you've tried to increase his amount of food during the day, but, if your ds is like mine, he eats until he spits up (or almost) at every feeding and then takes an 8 ounce bottle at his df! (If you haven't tried increasing his amount of food during the day, BTW, I would try that first.)
But, I had to realize that my ds just thought of that as his last feeding of the day. After I give him his df, he goes right back to sleep (unless he's teething) and sleeps until 7. Later if I let him!
So, I would say, as long as your lo is getting enough food during the day and going right back to sleep at night after the df, it doesn't really matter if he wakes up during the df. That's what I've found, anyway.
Of course, it won't be too long before you might be considering giving him some solids during the day. That might help him sleep through a df.
HTH!
Hugs,
Charlotte