Alright, so this have been happening sometimes when I am going to sleep.

I am laying in bed, about to sleep, and I start randomly thinking on stuff, could be anything, doesn't really matter, but after a while I guess I am thinking so much suddenly I am not aware I am going to sleep and so I get this weird feeling, almost like I am about to enter the dream and then whenever that happens I think that this is some kind of WILD and I guess I become excited or something, so my heart starts beating faster, and then I try not to focus on entering the dream, but I can't stop so it ends up in me waking myself up so I am totally awake.

If anyone have any information about such experiences, please share, and do anyone know if this is actually right before I enter a dream or not? If so, Is there anything I can do to stay relaxed while entering the dream?