The Timeline of the Nap

December 2006- January 2007, B.C. (Before Children)- I napped
January 2007- July 2007- No naps for Sophie or me (Gosh, those were fun times!)
July 2007- April 2008- 2 naps for Sophie, 0 for me
April 2008- February 2009- 1 nap for Sophie, 0 for me
February 2009- March 2009- 1 nap, accompanied by me to (a) transition her into her new room and bed, and (b) rest my 9 months pregnant self
March 2009- May 2009- 1 nap for Sophie, 4 naps for Lilah, sometimes a nap for me
May 2009- August 2009 - 1 nap for Sophie, 3 naps for Lilah, occasionally a nap for me
August 2009- May 2010- 1 nap for Sophie, 2 naps for Lilah, very rarely a nap for me
May 2010- 0 naps for Sophie, 1 nap for Lilah, maybe a couple of minutes alone in the bathroom for me if I'm lucky

And here's just a random question: At what point should one cease to hold out hope for something being "just a phase?"