This is the fourth song from Iron Maiden's 6th studio album, "Somewhere In Time" . To put it simply, the lyrics deal with a near-death experience, when someone is declared dead, and comes back to life. This song, along with "Wasted Years" has been the most played song live, and has remained a steady and popular part of their setlist since the album's release.
Can't understand what is happening to me
This isn't real this is only a dream
But I never have felt, no I never have felt this way before