I've been awake for about 45 minutes just lounging in bed so I don't think it was a weird-waking-up thing.
I just got up to open my blind and as I did it my knees started wobbling uncontrollably and I lost complete control of my hands and arms and legs. It kept going as I slowly fell to the floor and the whole time it happened I was completely confused about where I was and who I was. I looked over at my bed and didn't understand what it was.
The whole thing lasted about 30 seconds. Is this a thing??