Hi Welcome to HCM I have gone through your query regarding regarding nightmares due to medication .I can understand your concern . While most of us are aware that stress and anxiety can lead to troubled sleep and nightmares, these are not the only causes. In fact, numerous medications and health conditions can result in us experiencing nightmares. As a result, being aware that there are many causes of frightening dreams is important because it can help lead us to discover the underlying medical conditions that low blood sugar can cause nightmares. While most people with diabetes suffer from high blood sugar, incorrect doses of insulin can result in blood sugar levels going low. This means that for people with diabetes who awaken in the night to a nightmare, it is a good idea to check one’s blood sugar levels. With no end in site to the growing obesity epidemic, more people will be experiencing nightmares and will benefit in knowing why they are happening. Metmorfin has many side effects , unusual tiredness, dizziness, severe drowsiness, chills, blue/cold skin, muscle pain, fast/difficult breathing, Nightmares , slow/irregular heartbeat, stomach pain with nausea, vomiting, or diarrhea . Get medical help right away if you develop any of them. As you are taking Metmorfin as one of the medication , I would like to suggest you that it is better you consult your treating practitioner . He will be the best guide ,which medication is to be replaced or stopped , Hopethis helps solve your query . Take care . All the best . Don t hesitate to get back if have any further query .