Oh man. 
I woke up at 9am.
Actually when I logged off last night, I was sleepy! But then after
I brushed my teeth, somehow I couldn't sleep anymore. I remember
tossing and turning around in bed for so long, finally falling to
light and intermittent sleep after a long while. 
And just now I was so sleepy, I was nodding off while watching the
telebee. Wonder if I can sleep later.