winter => more sleepy days?

Am I not having enough sleep or just need more sleep?

Btw I had my first snow the day before yesterday. Simply fantastic! Esp if you have never seen the skies pouring anything but water so far in your life. Did all those silly things like catching the snowflakes on tongue. It was fun ... !
In fact that day was really a good day. After the morning meeting, went home and had a nice nap(!) for 2 hrs, then played some guitar. The evening greeted me with the first snowfall of my life!!!