migraine
"Because my migraines start while I am asleep, I do not get the "lights" prior to onset. I start by having ringing in my ears around 11 p.m., then around 2:30 a.m. the pain starts.  If I take a shot at that time, I can function during the day.  If not, around 4 to 5 a.m. I awake with a full-blown, blind-in-one-eye migraine and I cannot function for about 12 hours. Later it feels like someone took a baseball bat to my head and it hurts."