Why can't she be this quiet at night?

While she did sleep in her bassinet last night, I did not enjoy the same rest:P She makes lots of noise when she's sleeping--grunting, growling, whimpering and what we call "giggles". This is normal for preemies, and she should eventually grow out of it. But, in the meantime, mommy isn't sleeping through what sounds like a small grizzly bear hibernating next to the bed:P