Sometimes it takes me a few seconds to figure out where I am. Usually after I've had some of my more vivid dreams/nightmares.
This morning was one of those days. I had dreamt that I was hallucinating and couldn't get anyone to help me stop.
It took me a few seconds to figure out that I was home and safe and that I hadn't actually hallucinated but had been dreaming that I had. It felt like I had to do some serious mental gymnastics to get there though. I've been trying to do this thing where I test whether something is a nightmare by seeing if anything impossible is happening but that didn't help since , if I were actually hallucinating, impossible things would also be able to happen.
I guess my case is different though because it only takes a few seconds, but those are often a few seconds of absolute terror and then I wake up all sweaty and freezing cold and exhausted. Doesn't make for a good start to my day.