Doxylamine
"I started experiencing insomnia after separation and subsequent divorce.  Had "back-end insomnia".  Basically I could fall asleep for 2-3hrs but then would wake up.  Suffered from this for 3 years.  Basically I have an underlying anxiety that nothing could over power.  Not ambien, lunesta, zquil, melatonin, alcohol, valerian, etc.  However, I got a cold and took Vicks nightime decongestant.  Slept like a baby.  Awoke euphoric.  It had doxylamine in it. 25 mg.  Been on for 6 weeks.  25 mg a night. Sleep 7-8 every night.  Often awake feeling great.  Euphoria is the only side effect!  Doxylamine is really good for me.  "