I have a pulsating vein just above my left ear but below the skull bone that throbs when I sleep at night. It does not hurt. I do not have headaches and I have low blood pressure. The throbbing is simply annoying. I can put my finger on the vein and it feels like I am taking a pulse on the wrist. What could it be?
It can be normal temporal artery pulsations. If there is associated tenderness then there is a rare possibility of giant cell arthritis. Hope my advice will help you.  Take care.  Don't forget to rate me.