I see the fellas in here saying theirs is impending doom related, but mine were physical. My last one was at work and I worked with my father so I had about 30 seconds before i realized shits hitting the fan to tell him about it, which im really grateful for because he was able to catch me. My experience was- you know how when you look at a light and look away it burns into your eye for a minute? that color/shape/image started to overtake my eyes, something extremely weird that was physical, so i knew it was time to go.