Woke up with a headache this morning. 
I don't know if it was from being startled awake by an alarm on my phone I didn't know I had set that then disturbed my sleep rhythm.
Or from sleeping too long or too tense....
But I woke up with a headache behind my left eye that radiated down my neck and to my shoulder.
Advil and heat packs have helped to keep it from being anything majorly irritating.
But it still hasn't fully faded yet. 
So we'll see if it still is a problem on the morrow....