yawn

I'm having trouble sleeping.
It doesn't make any sense. I'm on my period, I biked a few miles yesterday for the first time in a loooong time, and I cried for hours last night. By every account, I'm exhausted.
And yet. Sleep doesn't come.
My mind is zinging through the atmosphere, though I tell it not to worry about things that cannot be changed at 3 o'clock in the morning. For whatever reason, my mind just won't listen to me.