Mike, it's not a good idea to swap info about chest pain. There are a thousand different reasons people experience pain. It could be as simple as indigestion or stress, but it might be more serious.

However, to answer your question, I'll get an excruciating pain in that area and it always goes away after I move around. Unfortunately, moving is very difficult when you feel as if you're going to die if you breathe! Sometimes my arm tingles too. However, I had an echogram and related heart tests to rule out heart disease in 2002 when a doctor thought I had a heart problem. I didn't.

Did you eat or drink something before retiring? It might sound difficult to believe, but often someone ends up in the ER because of gas, thinking he's having a heart attack. Better to be safe than to play guessing games.

If you don't get the pain again and you feel well, I wouldn't worry about it too much (which is contradicting what I just wrote) but you need to make that decision for yourself.

Mike, I wanted to add that it could be signs of an ulcer too. Do you feel as if belching helps? (not trying to be funny) When I used to get a pain in my lower left rib cage, I took Tagamet or Zantac and Tylenol and it went away.

Mike - most likely nothing. But if it returns - go see a doc.

It's probably nothing more than a wake-up call reminding you that you're getting older. However, if you're wise, you'll heed the advice JustX gave you. Gone are the days when you can ignore ANY symptoms, figuring you can just walk it off. If you need a reason to get yourself checked out, see your blog under the heading, "A Picture of Me and My Babies."
   They're going to need your guidance as they grow, so you can't afford to take chances like that anymore. It might have been just a muscle spasm brought on by sleeping in an odd position but, given the level and duration of the pain you described, it's definitely something you should bring to your doctor's attention. Let him decide whether it's a cause for concern.
   This is only my opinion, but soliciting medical advice from members of a lottery forum might result in an incorrect diagnosis of your ailment. If you can't see your doctor right now, use the following URL to describe your symptoms to the medical community. It's free, and it's really a very interesting site.
   www.webmd.com/.../symptom_checker.htm   
Jim