Dream about physically feeling dying?

[Iraconji]

So I believe it was last night (Or the night before) I had a dream where I was LITERALLY (Physically) dying. Not the usual 'See myself in third person dying, or falling off a cliff and waking up'. This was literally dying. In my dream I KNEW I was dying. It was so weird. It was kind of calming/weird, and it was weird ONLY because I knew these were my last moments on Earth (In my dream). I wasn't scared of the physical act of dying, just knowing that I wouldn't be alive anymore. Just recently I was wondering what it would feel like to die in your sleep (My friend died like this awhile ago). Maybe that has anything to do with it. P.s. I'm not scared or paranoid about the dream because it was kinda cool. I'm just always interested to know what dreams mean. I have a lot of dreams, I've remembered several a night since a few months ago. So I have more dreams if anyone cares to hear. (Some dreams about science I never knew of, some about seeing ps3 hacking code that I couldn't decipher if my life depended on it, etc.) Anyone know what this dream symbolizes?