I woke up repeatedly the other night, and at around 3 a.m I awoke and as I turned to the other side of my bed i heard a series of tones as if it were from inside my head. Initially I thought it was my phone or iPad going off but it was not. After about 15 seconds I heard it again and this continued every 15ish seconds, the exact same series of tones over and over. Am I hallucinating, what is is this?
Added (1). Also, with each tone there was a sort of pulsing, i was absolutely awake.
Added (2). The pulsing was in the right side of my head.
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I heard a series of repeated tones in my head over and over. What is it?