"i had horrendous insomnia due to a medication.  i would get 2 hrs. sleep and then be wide eyed and wide awake.   never even yawned or wanted to sleep.  the medication that did this is guanfacine, an older blood pressure medication.  i am on 7 different meds to attempt to get my b/p down near the normal range.  this medication works for me but to the detriment of my sleep.   i tried everything from over the counter sleep meds to ambient.  the last two worked but i didn&#039;t want to become dependent on them.   i finally tried melatonin.  even though the research shows that there is  no significant difference in placebo and melatonin, i found it to work.  it takes a large amt. (12g) and about a week or two, then it begins to work. yes!"