Sleepiness in rants

Again, I am trying to figure out my body. I can be playing on the computer, fighting sleep, wanting to finish something. Then when I go to bed... my mind is racing and I an TOTALLY awake.

The same thing with reading. I can read, fight sleep, put the book down... again WIDE awake.

Yet, during the daytime, I can nap so easily. And no, I don't always have trouble sleeping at night when I've napped during the day. There's little correlation.