How are you these days arthymum? Any improvement? Read this thread a bit late...
Just wanted to say, my boy was a bit like this around 4-4 and a half months. Got slightly better at 5 months & much much better at 6 months (which is his age now).
Here's what helped for us:
--doing all sorts of stuff so that he wasn't bored (yes! they do get bored more & more easily at this age, as you've identified... I find the idea of a 'babymoon' pretty alien to my experience, to be honest. My DS would go stir crazy with a babymoon, and so would I ) but if it works for some people, then that's great).
--unpopular as it is, what also really really helped with us was going from a completely unstructured, demand-feeding, laissez-faire approach to a more routiney type of approach. (Weird word: 'routiney'...but anyway back to my point!) I tried to encourage more milk in the day (did a bit more expressing too) & thus gradually his night feeding decreased. I also tried to encourage a bit of a structure in the day, by tweaking a few things here & there. 2 months down the line- now that he's 6 months- we have a much clearer routine & it's really helping, if I'm honest. I'm not rigid about it, I do make changes depending on what I want to do on particular days, but it's really nice to know what's happening during the day, to have a template in mind. And actually I really am convinced it's helped DS too.
--Finally, what also definitely helped was slightly earlier weaning. I started my DS on baby rice & some very mild fruits & veg when he was 23 & a half weeks. Now that he's 27 & a half weeks he's already on 3 (vegetable & fruit based) meals a day & that has meant he's finally started sleeping through from 10/11 until 7 in the morning. And just to say, this was a boy who up to 4 / 4 & a half months was waking every 1-2 hours at night to feed & was extremely grumpy.
Anyway. Just hope some or all of this helps! Good luck... let us know how you're doing.