well the easiest way i have found i think anyone can tell you, is that just repeat to yourself over and over that you will remember your dream and you will wake up from your dream, make sure its the last thing you think of right before you go to asleep, i have hard time doing this but im sure with more effort i couldn i use an alarm aroudn 3:30 only because it doesn't matter how i wake up ill remember the dream somewhat anyway. just make sure you practice this method as i have tried it many times and has worked a few times when i really put my head into it. sometimes i would wake up 2 or 3 times after at night after the dreams ended, but mostly today i use my phone alarm.