Wow, you are the first person I've ever heard that had the same experience as me. Ever since I was a little kid I've also been able to wake myself up during nightmares. And this is bizarre because I've experienced that same phenomenon about opening one eye to see your room and dreaming behind the other and the dream continuing as soon as your eyes close. Whatever the case, what you described, the struggling, and the eyes falling closed to return to the dream, sounds exactly identical to what I've experienced for years!