"i am a nurse and struggled with sleep while on night shift. i took half a doxylamine (restavit) and slept well.  an hour after waking i then went into fast atrial fibrillation (hr 160 - 200), i ended up in emergency needing d/c cardio-version to revert me back to a normal rhythm.  though i have colleagues who have had good results with this medicine i had a terrible experience and will never take it again.  potentially a very dangerous drug!!!!  be careful."