Does anyone know why when I start to fall asleep I begin convulse and then I dream but I wake from convulsing and I can't move for a few seconds and can't recall the dream that takes place?

If you are truly "convulsing," you need to consult a medical professional. [See description linked below.] But you might be using the Word to describe the very common small jerk that occasionally accompanies the transition from waking to sleep. This is merely a mixed signal - like a hiccup - that happens as your muscles begin relaxing.

> It is also perfectly natural not to remember dreams. Dreams are a function of the subconscious mind, so most dreams are not remembered when your conscious mind awakens.

> Again, the momentary inability to move is quite common and is known as "sleep paralysis." [link attached below.] This is a natural inhibition on voluntary muscles that prevents you from acting out every dream that passes through your mind as you sleep. It is entirely natural, and might be related in some way to the little jerk experienced as you fall asleep.