Sleepy Head, Is That Me

At sunrise I find I am in bed, fast asleep until the last minute And post sunset I know I should have gone to bed, but it was always, not just yet But, in between it has been said, that I never left my bed I think therefore I am a sleepy head, who always needs my cosy bed And although that winter is now looming, I can not see my sleep pattern re-tuning So what am I supposed to do.. but become a Bat like you And sleep in bed all day too... Just like you always do.. DAMO