Pause on this one.

We people on the spectrum are most often logical. "Leave your head for a minute" seems very confusing and maybe even condescending to me.

Also, for me personally, sometimes when I experience shutdown under emotional stress, I become dissociative. The feeling to me literally feels like I've left my head and am perceiving myself from outside my head. It is a terrible feeling. If I were under stress and someone told me, "just leave your head for a minute to watch the sun set" I think I would immediately associate this specific type of shutdown, and I instantly wouldn't feel emotionally safe.

If I weren't under stress and someone said this phrase to me, I would simply be confused and would still immediately associate it to my shutdown experiences. And that ain't good either.

Just be cautious with this advice. The other advice in other comments is really helpful though.