Enviromental Noise Levels Synced to Pulse at Night

I've had this happening for the last 3 months or so. I will wake up in the middle of the night with environmental noises fluctuating in loudness to the point where my tiny fan will start sounding like a jet engine or a T-rex, but only for a second or less until it goes back to normal. The loudness waxes and wanes exactly in sync with my arteries pumping blood in my head.
My tinnitus, which is usually just continuous, will start behaving in a similar manner too.

Any thoughts on this? I have experienced pulsatile tinnitus on some occasions before, but I am still pretty new to it and what causes it.

 

@Coyotesheaven Sounds like you have a touch of hyperacusis (sensitivity to sound). Do you sleep in a quiet room at night? Not a good idea if you have intrusive tinnitus. Consider using a sound machine by your bedside for sound enrichment.
Click on the link below as you might find the information helpful.
Michael
https://www.tinnitustalk.com/threads/sound-machines-and-tinnitus.12072/

 

@Michael Leigh

I do use a fan at night. Averaging 40 db while I sleep every night.