Try dimming the lights as you get your baby ready for bed. By darkening the room, you reduce the amount of stimulation she’s getting, which will help calm and settle her. A darkened room also tells her that it's time for rest. Once your baby is in bed, she’ll sleep better if the amount of light in her room is consistent.
Children can sleep with some noise. Your child doesn't need an absolutely silent room to sleep. But it is easier for her to go to sleep when noise levels are kept consistent. If she falls asleep to noise, hearing less noise might wake her up.
DiLeo H.A., Reiter, R.J. & Taliaferro, D.H. (2002). Chronobiology, melatonin, and sleep in infants and children. Pediatric Nursing, 28, 35-39.
Peirano, P., Algarin, C. & Uauy, R. (2003). Sleep-wake states and their regulatory mechanisms throughout early development. The Journal of Pediatrics, 143, 870-879.