Are sleep studies a con or did they change your sleeping habits?

I don’t need a so-called “sleep study” and wouldn’t get one even if told to. From what I’ve read you are hooked up to machines , which would automatically prevent me from sleeping, then “monitored” all night in a strange bed in a strange place. It seems ridiculous to me but have you had one and it helped you a lot? I read one person who spent three nights during a sleep study. She didn’t sleep the first two nights so what did they do for the third night? They actually gave her an Ambien and she slept like a rock but had no memory of the first three hours after she woke up which included driving home! Not saying it’s simply a way to push tranquilizers off on people but it’s possible . How about your opinion?