Unilateral Headache
Keep in mind that cluster headache only causes unilateral pain, which means it just occurs on one side of your head. The sensation often starts behind one eye and gradually moves to the brow or other parts of your neck or face. Nighttime attacks tend to have greater levels of intensity with larger affected areas. This makes it much more difficult to fall asleep during the night. In these cases, OTC pain relievers are often the best option to deal with the problem if you cannot stand the pain. [2]
