Is it possible that prolonged use of a sleep agent, such as Imovane, can cause one to become extremely tired? I'm not referring to next day drowsiness, but sporadic days of extreme fatigue like symptoms. Something in the order of about one day per week, after 2-3 weeks of nightly use. I discontinued the medication after pretty much dealing with a medical crisis, and I felt better the very next day. Could this have been the cause? Thank you.