Morning stiffness

Weather is quite unsettled here. Yesterday morning when I was practicing the sun shone through the window on my face, today it snowed. Also as I went home from work, it snowed. Mostly I go by bike. It's a wonderful route, almost completly through forest. I live at the city limit and my job is in the next village. It takes about 20 minutes to get there by bike. Today the air was ice-cold and snowflakes on my face, but it was refreshing. It's a good way to start the leisure-time because you get your head free of job thoughts.
Practice today was ok. The concentration really is missing quite a bit, too many thoughts about unimportant stuff, I have to work on that. It felt as if I was not really willing to do the practice and the mind is searching for whatever to escape from practice.
And one pose is absolutely terrible in the morning: it's Paschimottanasana, there all the morning stiffness strikes me hardest. When I practice at any other time it's possible that my belly touches the thighs but in the morning absolutely no chance! I wonder if this will ever change. But I read that this stiffness has a protective function, that it prevents us from injure ourselves, this function gets lost in the evening. I will believe it and try not to become desperate in Paschimottanasana.