Yes, I have been there. Not a bad thing, at all for me !!
I think for me, it's like a trance. Like my mind just shuts down for a while.
HMMM>>>> Like to offer some advice,... but nothing comes to mind. I liked when i felt like that. Like you said, usually the emotions were extreme,... so I didn't mind the "peaceful, empty feeling". But I am not sure it's healthy either.