What is tachysensia?
During this time, body movements seem to speed up anywhere from 1.5 to 3 times their normal pace, creating that trademark “fast feeling.” Sounds may also be amplified, often to a physically painful degree.
People with tachysensia experience episodes where everything appears to be speeding up, and sounds become unusually loud. These episodes are short in duration, usually lasting no more than 10 minutes, and unpredictable in nature, making them difficult to study. They are known by many names, including quick-motion phenomenon, the rushes, rapid spells, and fast feeling.
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What I think may be exploding head experiences are like this: It always happens towards the end of a daytime nap or after most of my nights sleep. There are very bright white light(s) and then a very loud crashing sound. The sound could be described as either an explosion or something big and heavy falling onto a concrete floor. Its deep and there are no high pitch notes to it. The first time it happened, I dreamed that there was a very big explosion like a nuclear bomb that went off over the sea (I lived on the coast at the time) and I thought it was real. I woke up and ran to the window to check, but there was nothing. Since then I’ve had it a handful of times and it usually wakes me up. My hearing feels a bit impaired afterwards, like I have heard an actual loud noise.