for years as far back as i can remember I have had episodes of where I would go to sleep at night or during the day and i would be alert but I couldn't move or open my eyes. Other times I could open my eyes but I couldn't move. One time that it happened my I could feel tears rolling off of my cheeks like cold acid burn. Another time I woke and I couldn't move, then I gained movement but I couldn't see my hands could feel my eyes were open but all was dark. Eventually in all of these I regained everything but it is very scary and it makes me wonder one day will I go to sleep and not wake up. Is that what some comas are like-going to sleep and not waking? Please if you experience this or have any knowledge of what it could be please advise. Thank You.