I'm 32. I used to get this feeling a lot when I was younger. Out of the blue I had one a few minutes ago. Started off with the sensation of my sense of what would it be called...the feeling of where I am in space felt delayed. Kinda felt like a pseudo third person feeling as if there was a lag in my movements, then bam, everything felt like it was going a mile a minute, every small movement felt rapid and fast, noises seemed sped up and my thoughts raced, but I checked my pulse and it was normal despite feeling like it was high. I think it lasted 10 or 15mins. I'm now wondering if it's something to do with my adhd but then again the fact it's been prolly been 15+ years since this happened last is worrying. And it also happened when I was trying to get to sleep at night.