the second sock

I just finished up this pair of worst weight knee socks.  I love them and can’t wait to knit more knee socks.  I know strange desire to knit tons of knee socks, but here is the problem.  Last night I was knitting the second knee sock and measuring it up against the first sock.  The closer I got to the end the more excited I was, but at a certain point my sock did not seem to be getting any longer.  I was knitting row after row but didn’t seem any closer to finishing the sock.  It is a strange phenomenon that happens to me when I knit socks, mittens and sleeves.  I cannot explain it but it gets me every time.