I found a way for myself, set your alarm 6 in a half hours to get you up. Turn it off immediately ONLY IF YOUR ARMS DONT MOVE ANY OTHER PARTS OF YOUR BODY! go back to sleep in the same position you were. Best if you went to sleep with your body towards the clock so when it goes off all you move is your arms. Now think of a scary thing, like a spooky mask or something in the dream scary. 5 minutes later you'll feel an intense push and the scary picture you thought of in your mind might pop up a little bit. You will not be able to move at this point. Don't freak out this is how your body is the whole time ur dreaming to protect you from jumping out a window. It's gonna feel very very scary but remember its only my dream state and body and nothing is on your bed or whatever is scaring you. I don't know why it helps me to think of something scary when I go back to sleep it just works for me. Than once you feel you cant move, open your dream eyes!