I personally don't have a problem feeling claustrophic in there, but I can understand how some people do. It's a very tight space. And Yes, you do have stay very still! If you move, it blurs the images and they have to do it over again, which means even more time inside the machine. I cannot stand to have them done anymore. I've had several done, but each time I was in a lot of pain. Usually my problem caused me not to be able to be straight, like I couldn't stand straight nor lay down flat. And of course, I had to be flat inside the MRI (except they put a little pillow under knees one time). That was the most horrendous thing for me. I was already in severe pain and laying in there made it even worse. I tried mind over matter, but it just wouldn't work. I usually ended up moving around b/c of the pain and having to do images over. Usually it would take me 1 1/2 to 2 hours, ughhhh. Then another time, I had severe sciatica and spasms, and I also developed bladder problems. I was going to the bathroom, though just a few dribbles, literally every 15-20 minutes. So that time, I had to stop the MRI and use the bathroom a few times. Needless to say, the MRI technician was quite mad at me and let me know it. What a jerk. I was never offered any kind of sedatives, though with any of my MRI's. I really, really never want another MRI again.