Good job. You just need to make surebyou are out of it enough to not have your heart beat like that. You don't want to notice when you are getting ready to go into a dream. You want to notice as soon as you enter a dream. Congrats on the progress though. I would say that you need to either try it at a different time in the night, or practice not concentrating on the things around you. Also practice calming yourself. Meditation can help both of those things. When I meditate I don't try and "lose track of myself" I just sit there and visualize and eventually I am extremely caught up in what I am visualizing. It is clearing my mind and thinking solely about LDs. I normally imagine the beginning of the lucid, but for you you might want to visualize waking up and visualize the getting excited, then calm yourself. Good luck.