Hello, Thanks for posting this question in this web site First of all let me tell you that your symptoms are not suggestive of fatal familial insomnia, a very rare disease. I hope that (as you have not posted and the duration of insomnia ) you donot have any other symptoms which can suggest this rare diagnosis. This rare disease is also accompanied by other neurocognitive, autonomic and psychiatric disturbances which you donot have (which how ever you have not posted). The approach to patient with insomnia is basically to find out if it is due to any other cause like change of place, any medical or neurological illness or psychiatric illness. If these causes are excluded then the diagnosis o. f primary insomnia is entertained and the treatment begins Lots of medicines advised for insomnia can result in sleep architectural disturbances and he medicines which you have taken can result in such problem, i mean sudden REM onset. The treatment of primary insomnia is basically is a good sleep hygiene ( go to bed at correct time, donot take coffee after 6 pm, donot exercise after 6pm, no hot bath in the evening, avoid stress and do relaxation). If these fails you may try a small dose of clonazepam. As you are so grossly preoccupied with the idea of fatal familial insomnia, my explanation may not be satisfactory to you. If so, go and meet a sleep specialist and undergo a polysomnography test and see a psychiatrist to rule out any cause which can present like this. Hope this clarifes