after the wife had each one of the kids, ended up sleeping on the couch or chair for 3 -6 months before her back would come back in shape.. after the 3rd, it was 9 months and I said enough was enough.. Went and got a sleep number and cured it all in a matter of days.  Going on a year, and sleep very good.  You can tell when that 3rd kid gets ahold of the remote and changes the settings.  Hers and my back hurt in the morn..

 No hole in our center, but a buddy does, but his is much older.  Thought they put something in the middle to stop that, but that is what the salesman said.. Never trust salesman..