Before I go to sleep at night, I have to check the perimeter--doors locked, windows only slightly ajar, car locked.

It seems to be an instinct, to set the safety zone against intruders. Then I can sleep soundly, deeply, restfully.

Sure, I know that windows can be pried open (lots of noise) and doors can be jimmied or chiseled (lots more noise) and cars can be hotwired (an alarming possibility), but those are eventualities that I can neither predict nor prevent. So I don't worry about them.

I let them all go--all the possible bad stuff--and fall into a deep sleep.

Or (it just occurs to me) am I OCD?

The only answer is that it seems to be instinctive, but I have no way to tell. I just check the perimeter and, satisfied that all is well, crash.