My mice were all diurnal at first, at which time they did make a little bit of noise at night. However, they are so funny now! They have become conditioned to the light turning off!:
You see, they live in a Crittertrail 3, which has this long tube up one side leading to a little tiny ledge-type room. And after I've had them a while and they've learned that it gets quiet at night, and they don't get any attention or food then, so as soon as I turn out the light they crawl up the tube to the ledge, one by one, and go to sleep! It's soooooooo funny. haha
Either way, I recommend them as pets because they are so beautiful, fun, and lovable! Plus easily cared for and relatively inexpensive as a bonus!!!