I have to tell you, I don't think Novolin is made anymore. It was discontinued. Perhaps you have a pen remaining from old stock. So you should probably check the expiration date on the pen and/or box.
Novolin N (NPH) can be use as a basal although it acts more like an intermediate. That being said, both Novolin N and Humulin N are what are called suspensions. They are supposed to be cloudy. In fact, part of properly perparing Novolin N is to gently role the pen and flip the pen to evenly distribute the suspension. I roll it ten times and then flip it ten times. Don't shake it. Do it gently.
Sorry I didn't get to you before you went to sleep.