Nursing my neck?!

Usually this happens with kittens that were separated from their moms very young, or just have a very strong need to be comforted. They continue to try to suckle off their humans to regain the comfort that they got from their moms. I had a kitten Oscar (abandoned by his mom at about 5 weeks old) that tried to suckle on my ear lobes and nose at night. You're right - it was annoying. But when they are this small, you have to walk a thin line between wanting to encourage them to bond with you and wanting to get a good night's sleep.

The good news is that they outgrow it eventually. The best way to modify a cat's behavior is through redirection. If you don't give a substitute to the behavior, they don't learn right from wrong. What I did with Oscar happened through trial and error. At first I brought the sheets over my head so he couldn't get to it. He would curl up on top of the sheet, wiggle around and purr loudly, so in the end it didn't really work. Next I started to move him away from my head to be close to my chest, and would pet him for a while then drape my hand over him to hold him tight against my body. That worked great until I fell asleep, then he moved back up to my head. When he woke me up, I moved him back to my chest. This eventually worked (took a few days) because he was rewarded while he was next to my chest, and his behavior redirected when he was by my head.

You need to be consistently firm and patient with them at this age. Your alternative is to keep him out of your room at night, but you will lose some of the bond you are trying to develop with him. I personally always go with a little annoyance to retain my bond.