insomnia
"I am a 67 yr old male. Had shingles about 2 years ago and my doc rx'd gabapentin. Gave only minimal pain relief. I've had insomnia for years but never sought treatment. Had tried benadryl, that made me sleepy but I would awake after 2-3 hrs. So tried one 100mg gabapentin and 25 mg of benadryl in pm. Fantastic!  I sleep 7-8 hrs of restful sleep with no noticeable side effects. The normal higher dose had no added benefit for me and tended to make me slightly dizzy."