Doxylamine
"I'm a 23 yr old with severe anxiety and insomnia and my insomnia has been getting worse over the past few months. I can't remember the last time I slept through the night or fell asleep in less than three hours. Melatonin did nothing for me and Benadryl didn't do much either. I tried unisom last night. I fell asleep much faster than usual- probably took me about 30 minutes. But after 2 1/2 hrs I was awake again. I couldn't fall back to sleep. I tried looking up if I could take another 25mg (I had taken 50mg before I went to sleep) but I couldn't find anything about whether 75mgs total is too much? I'm frustrated because it put me to sleep so quickly, and I slept heavily, but it lasted so short a time that it barely made a difference."