Premature Baby Sleeping at Night?

We brought home our baby two weeks ago after he spent 8 weeks in the NICU (born at 30 weeks) and is a very strong, healthy boy now...with one exception...he does not sleep at night. He sleeps during the day but at night he is up all night long. I know that this is expected with any newborn, but I was curious if anyone else, that has had a preemie, has had the same issue. I wonder if it it is too quiet at night and he is used to the noise of the NICU and the noise around the house during the day...any suggestions to help him (and us) sleep would be MUCH appreciated!!