Body trying to tell me something?

[quasigeostrophy]

This is at least two, possibly three if I recall correctly, weeks in a row wherein I've had a fairly productive Thursday off work and I wake up on Friday with a headache strong enough to shoot any ideas of being just as productive completely out of the water. So much for the advantage of having two days off in a row.

Is my body telling me, "Take a damn day off and do nothing, dammit!!!"?