Seriously. Please help! My 8 month old son is sleeping the worst he has ever slept and my husband and I are beyond exhaustion. Last night he woke up 17 times I think. He has never slept for more than 4 hours since he was born. 
At the moment he is going to sleep at about 6.45/ 7pm,but then waking approximately every 45/60 mins (sometimes every 20 mins) until I give up at about 2am and bring him into bed with me (I don't particularly want to co sleep). He then lasts until about 4am and then wakes up at 5am and 6am until I give up and go and make myself a vat of coffee.
He does have quite decent naps in the day,although these have also reduced in length lately. I would say he has about 3 naps a day at approx 8.30am, 11am and 3pm. He has just fallen into this pattern himself.
I think I am just overwhelmed with where to start sorting this out. What method should we try? Or is it all just a phase brought on my the light evenings or teething or a regression?
We do have a routine of bath/ story/ bottle etc and make his room as dark and cool as possible. He is not good at self settling at all (obviously!).
I would be so grateful for any advice. I really don't know where to start.