I have been experiencing throbbing headache mostly in the early 4-5 am or as soon as I get up from sleep. Some times I do experience the headache later in the day as well. It is localised pain mostly at the back of my head or one side of the head. It typically happens 5-6 times a month and has been happening since a year now. I don't experience headache when the fan is off at night. I generally have atleast 7 hours of sleep in the night.