How long is your daughter sleeping during the day?
Where is your daughter sleeping?
Have you tried a sleep (get ready for bed) routine?
So that she knows night time is sleeping time and daytime is nap time, she should only be sleeping a max of 2-3 hrs throughout the day. If she is napping for more than 2-3 hours, wake her up gently and try to keep her awake.
Also try to have her most awake stretch being the hours before bedtime (say 5-8 pm). I'll also "tank up" my 8 wk old daughter by having her feedings (she's breastfed) closer together during those hours.
On the flip side, never wake a baby that is sleeping at night. My 2nd daughter is starting to sleep through the night at 2 mos. old as opposed to getting up at 3-4 am. She's been in her crib since she's been home from the hospital and I finally have turned the monitor off at night because she is a noisy sleeper. Now, I only get up if she is crying for more than 2-5 mins--its not Feberizing, just making sure she's really awake and needs something.
For awhile there, I think I was rushing into her room too early when she was still asleep. Now that she has found her hands, she'll suck on her fingers and soothe herself back to sleep. So, my point is... try having her sleep in her own room and don't rush in right away until she is crying for more than 2-5 mins. Don't worry, you won't wake up the household (I too was worried about that) if she is crying for a short time.
This is my most important advice & proven to work:
Try doing a sleep routine-- its easy. Bathe the baby, rub her down with some lotion (a nice massage can't hurt), put PJs on her, and do a feeding. We usually start this around 7:30/ 8 pm. I then wait until she has a limp limb (pick her arm up and it flops back down) before putting her in the crib for the night at 9:30 pm. And even if she stirs when I put her down, she falls back asleep on her own.
Some tips: I always use the same lotion for nighttime (J&J's lavendar bedtime lotion) and will use a separate lotion for the day. This way she associates that particular smell with bedtime too. And if we are away from home, the smell of the lotion helps to soothe her and make it easier to fall asleep in a strange place. As she gets older, you can add or subtract things to the routine (like reading a book and brushing teeth).
I also have a cribtoy (one of the ones that lights up and plays music). I'll turn that on too so that the baby will focus on the toy and zone out as I exit the room. Now my 21 mos daughter will turn it on herself if she wakes up in the middle of the night and will go back to sleep on her own.
I've done a sleep routine for both of my daughters (one is 21 mos and the other 8 weeks) and it is the BEST thing. They both go to bed easily and stay asleep for 10-12 hours. Its simple and it works. Trust me!
I hope this helps! Good luck & Sweet dreams!