anxiety
"I have been using this med on and off for years for insomnia.
I use .5 mg dose.  It is very effective for me to get to sleep. And, even if you wake up in the night you can fall right back to sleep.
Plus if you dream, you may have only positive dreams - no bad situation dreams. At least that is my experience. Other over-the-counter sleep aids give me that hang over feeling in the morning.
Not Alprazolam (Xanax). Used occasionally, it is a good choice."