When I took my wee boy home (he is now 3 months old) I started co-sleeping and breastfeeding at night was very easy but the problem was that every single noise woke me up, even if it was just a wee snuffle.
Then my hubby and I put him in his bed at night (awake!) and waited until he was falling asleep, not doing anything. He wouldn't make a fuss and he was very sleepy. At the very beginning he would want to be fed at 8pm, then at 1 am, then 4am, then 7. During the feeds at night I wouldn't turn on the light, talk or change his nappy (only if necessary). At 7 weeks he started to only want a feed at 11 and then again at 7 or 8 in the morning. Since he started teething that has changed a bit though. Anyway... everytime I tucked him in and stood by his bed he seemed restless, even crying sometimes. As soon as I went out the room though he would fall asleep with a smile on his face, so I guess my presence was just overstimulation for him...
Since then I feed him at 6pm, tuck him in and go out the room for 10 or 20 minutes. I can hear him from the next room slowly falling asleep without a cry at all. Then I stay awake till 10.30 or 11 when he feeds again and then we all go to bed. My husband and I take turns in getting him up in the morning though so that one of us can always sleep a bit longer.
Well... try to actually tuck your tired(!) wein in and leave the room for a few minutes, it really helped me.