nothing like this, but I once many years ago got out of bed to go poddy in the middle of the night. Not knowing that I must have at times low blood pressure getting out of bed in the middle of the night was sound asleep, I was standing up in bathroom doing my duty and passed out and hit my head on the rod in the shower surround cracking the bar in two built into the fiberglass shower surround.
I woke up with my wife standing over me yelling at me to wake up, very odd feeling to feel clammy and with a HUGE bump on top of my head.
Then, soon after that my wife passed out on me in the hallway in the middle of the night and lo and behold I got up and we BOTH woke up together both passing out in the middle of the hallway at night all clammy and sweaty not knowing what the F just happened. VERY odd feeling for sure.

So, YES, stay in bed is best, but when you gotta go, ya gotta go....