The Creepy Crawlies

Does anyone else experience this? Last night I woke with a start. Something was crawling down my arm which was out and above the covers. It felt like a spider, at least like some sort of small bug.

Before I was fully awake I snapped my arm up in the air to rid myself of the creepy crawler that was invading my person. Now here's the thing. These creepy crawlers visit every now and again. Not every night, nor even every month. But it's not rare.

I have in the past been so sure I was experiencing a bug infestation that I've jumped out of bed, turned on the lights, thrown back the covers, and hunted everywhere to find the invader, ready to pounce and kill the invader. But surprised as I been, I've found no culprit!

This hasn't just happened once or twice. *\*-My middle-night safaris have occurred maybe four or five times in the past say four years. Usually after my fly-swatter-in-hand-ready-to-pounce-exhaustive-searches, I settle down enough to go back to sleep, thankfully without bug invasion night mares.

 A couple of years back there was a spat of bed bugs going around the neighborhood and I was sure that was the source of my attacks. However upon close inspection, no such issue. So what's going on?
When I looked this up online here's the causes I found: Morgellon's Disease, Menopause, Allergies, Certain Medications, and/or Withdrawal Symptoms. Thank God, after some serious reading I ruled those out. Next I came upon this:

The medical term to explain the crawling sensation on skin is formication. Many researchers believe this is a form of tactile hallucination..

Ok, so now I'm left with that I'm hallucinating.

 Damm!