I use it all the time, because I have horrible insomnia. I have 10 mg pills, and if I really need to fall asleep, I take a full pill, otherwise its a half. I use it about half of the nights. I also have ambien CR, which helps to keep me asleep.

The only issue I have sometimes is feeling a bit sluggish if I've been taking it a few days in a row, and an upset stomach. Also, it can be addictive in the way if you think about how you didn't take it, and start fighting sleep, so you give in and take it, kwim?

My mom, sister and I all take it, and we've never done anything crazy, or gotten sick, etc.
Also, yes, after awhile at least with myself, I need more of it to fall asleep if my body has gotten use to the current dose.