I started to do a feed and put DD to bed by 7pm then do a 'dreamfeed' at 10pm (DD is normally asleep for this). For the first couple of nights she woke at 2-3am and I re-wrapped her and patted/rocked her back to sleep and she will now generally sleep right through to 6-7am. I started doing this at about 12 weeks as I too was exhausted from continual feeding, she's now 16 weeks and still sleeping well at night.