Is it bad to tape a pacifier to your mouth for the night
I would think so
Yes, it's a bad idea. If it's important to you, just practice with it but if it needs to come out of your mouth for any reason, you don't want to prevent that.
Try using a MAM. That is all we use and they stay in babies mouth.
My suggestion, get a string, or say, part of a shoelace. And tie it via the "air holes" in the guard. tie it around your neck loosely, so that you can spit it out if you want to, but it won't fall out on it's own. Just loosely in your mouth. (I had issues with my mouth opening while sleeping that it fell out, waking me up.) This means that if you want you can easily spit it out, but it won't fall out on it's own. I do this, and I find it helps a lot. In fact, now that I am more used to it, I dream less and sleep more soundly at night with my paci.
If you are using a smaller paci, you might have trouble developing a "seal" with it. If you don't have a seal, youmwillnhave trouble with keeping it in. Invest in a larger paci if you need to