Some toddlers actually fall asleep more easily when they hear some noise in the background than when left in total silence. Experts say they probably feel more secure hearing nearby voices.
Also, when a child is tired, she’ll find a way to sleep regardless of any noise. However, it is best to keep the noise down and lessen any disturbing sound around or near a slumbering tot.
If you still have things to attend to late at night, you can try to lie down with your child until she falls asleep, then get up to do whatever it is you need to do. Just make sure you check on her frequently, and use bed rails to prevent her from rolling out of bed.