What happens after we die is a very common thing to think about, because the answer is so unknown.
But people who have been pronounced clinically dead and then revived again have been describing exactly what they saw and felt during the time their hearts stopped - and there are some pretty varied experiences.
It comes as a team at University of Tartu in Estonia recorded the first ever brain activity during death in a ground-breaking scientific study. Scientists found that the brain keeps working for a short while after hearts stop beating, and in the wake of this, one person took to Reddit to find out more information from people first-hand.
Posting on the online forum, they asked: "People who have been clinically dead and then revived/resuscitated: What did dying feel like? Did you see anything whilst passed on?"
The Mirror reports that in response, one user said: "I was getting an angiogram done, wide awake watching the screen and talking to the doctor. Alarms started to go off and everyone became panicked.
"My world became soft and foggy and everything faded to black. Next thing I remember was opening my eyes and hearing a doctor say, 'We got him back'. It was really a peaceful feeling more than anything."
Another user added: "My heart stopped and every muscle contracted. A nurse rushed over repeating 'Keep calm' as they got out the paddles and then nothing.
"I don't recall being shocked. Three days later I awoke. I don't remember anything in between."
Some people's experiences were more "out-of-body" and even had some paranormal touches.
A third user said: "I flatlined in an ambulance. In that short amount of time before I came back I had a bird's eye view of the ambulance I was in as it was running red lights.
"I was out of my body and ascending, that's all I remember. I woke up the next day in hospital with my family around me."
One more user added: "I was taken in for an emergency hysterectomy and they had to give me 11 units of blood.
"The night after the surgery, I continually would stop breathing and they told my partner they were expecting me to go into cardiac arrest at any time.
"I remember seeing my dead aunt sitting on the bedside while I felt my spirit lifting up out of bed. She looked at me and said, 'Dammit, it's not your time yet. Now knock it off!'.
Don't miss the latest news from around Scotland and beyond - sign up to our daily newsletter here .
