Hello, I'm in need of advice for getting my 17 week old DD to sleep through the night.
Up until 3 weeks ago she was waking up once or twice in the night for a week feed and then settling back to sleep quickly.
Now at 17 weeks it's a bloody nightmare. Tonight she went to bed in her cot at 8pm (last nap finished at 6.30pm) and woke at 8.45pm, 9.30pm, 11pm, 2.30am and then a long process of re-settling/crying/rocking/feeding until now 4.50am when she is asleep on me and I'm shattered and feeling the rod I have made for my own back 
I know I should put her in her cot awake but she always falls asleep on the boob for her last feed and if she goes down awake she thrashes about and shouts while I sshh pat and more often than not it escalates into crying. I take her out to soothe her which usually involves rocking or a feed. She goes back in asleep and then it's only a matter of time before she wakes and we start over.
I know she should go down awake but I can never settle her in there if she goes in awake.
I'm at a loss to know why our nights have become so bad. Is it sleep regression, teething, or am I just reaping what I've sown?
Any advice on how to crack this would be gratefully received. Thanks!