I very vaguely remember this particular movie as I had seen it at least 10 years ago. In it, a group of people are stuck in a house or large mansion and there are these little creatures that are attacking them.

There is one distinct scene I remember. A girl from that group is asleep and one of the little creatures creeps up on her and sucks her breast.

Can anyone tell me which movie that was?

Could be Critters or one of the many Critters sequels. Funny little fellows.