I have also tried to find an answer for something similar that happened to me 16 years ago. It was in September 1996 that I went to sleep one afternoon around 3:00 p.m. When I woke up at around 5:30 p.m, everything around me has changed, as it seemed to me. I felt that I have slept for hundreds of years and lost all those years sleeping. I sat there looking out the window with tears streaming down my eyes. I left so lost. I felt that everybody who lived in my time have gone and I felt like a stranger in another era, another time. I could not identify any of the surroundings nor the people around me. Its a very strange feeling, a sad feeling, a feeling of being lost I could not fully describe. It went on for a week and disappeared. But it caused something in me - the fear of sleeping during the day. For 16 years now, my body's biological clock can not "shut down" to sleep during the day, even though I may be very tired. I can only sleep after 7:00 p.m when it is dark outside. The fear of sleeping and waking up with that feeling and sense of time distortion is still fresh as yesterday. Maybe somebody can help explain.