I heard that if you use a face mask incorrectly, it can actually strip away your moisture...

I don't use face masks that often. I'm so lazy that I barely manage to remove my makeup before going to bed. Still, I do try putting one on once in a while in the evening while watching TV. I used to see people sleeping with masks on in dramas, so I thought that was normal, but I heard you're not supposed to do that. Some say you shouldn't leave them on for more than 15 minutes, others say you need to leave them on for over 30 minutes—the advice is all over the place. Hearing that it can actually strip moisture away makes me scared to do it. My skin is extremely dry, so I really can't afford to lose any more moisture. I've heard that using masks incorrectly can actually hinder hydration... Please tell me the proper way to use them.