Thanks for the replies, all.

Since this is about my Chronic Daily Headaches, it involves my head. My only real concern is, I'm kind of fidgety. I'll have to ask for a valium or something.

Having to remove my glasses is okay, I guess, especially if the MRI chamber is a close fit. If a wall is smack dab in front of me, well, I'm not claustrophobic, but I dislike that 'hemmed in' feeling.

Good points, everyone. I'll have to look at my sweats to see if I have any without metal eyelets.