I have been practicing trying to astral project and have been doing exactly as the book tells me to....?

I have been trying to astral project for about a week now. I do every step that I am suppose to I even feel the "floating" feeling. But I don't remember anything if I actually astral project. BUT when I wake up I have sever cotton mouth, I feel so tired like I didn't sleep at all, and very weak. I was wondering if anyone out there has astral projected and felt these same symptoms? If that is the case why cant I remember it? I plan to keep practicing and trying to prefect it. I just want to know if those symptoms I have when I wake up are normal, and I am open to any additional advice on how to better prefect my astral projecting, and remembering it! I thank you so much for taking time to read this and for all you your answers.