If you are putting your baby down to sleep at say 7.30 with a bottle or BF then why don't you try giveing a roll over feed at say 11pm if not already.    Just get your baby out of bed without waking and feed.    Make sure the room is still darkish and there is no noise.

My baby is 1year old and still stirs during the night.  We give dummy and teddy and make sure he is warm enough.   this happens about 1 - 2 times a night.    If you have a dummy you can get an attachment that clips on to the clothing and the dummy so if it falls out hopefully the baby can then find it and put it back themselves.

Good luck with it all.

At that age I think we'd go for walks and keep the evenings interesting until final feed/change time about 9 or 10pm. After that it was lights out until 3am for many months. Then a few hours sleep until 5am.. then 7am and then the 2 hourly feeds would return until bottles increased and solids started at 6 months. We were lucky in that after "servicing" baby went back to sleep on the whole.

If the problem is crying etc. after waking I guess its a different issue. Make sure night is NOT interesting. No reason to be awake after being fed/changed. Make sure that you give her/him time to settle, and don't rush into soothe/cuddle and encourage the idea of waking.

Dummies help... until they fall out! 

Check the obvious - no bright lights outside or noises from nextdoor that are waking them..... (I once found a working alarm clock found its way into the nursery toy box... it did its job at 4am or something for several days!).

Well with my boy I know this sounds cruel but it works is "Tough Love" i Left him for the night without getting up to him once, The next night he only cried for a few hours then went to sleep due to the fact he knew i wasnt getting up to him, The 3rd night didnt hear a sound from him.

But before i started this i gave him an extra feed before bed so he didnt go hungry.

My baby is 4 and a half months and he is the same he usually feeds every 3 hours. I think that they will start sleeping longer when they're ready to... i can sympathise with you, i love my sleep and don't know how i get by.  My girls slept through the night from birth but they were bottle fed, maybe that made a difference... is she breastfed or bottle fed?