For me, sleep (when I'm not dreaming), is pretty much like death - your consciousness is just turned off. The only difference is that, with death, it's permanent. But, given that sleep is no big deal, I don't see why being dead should be.
I found the experience strangely comforting - basically the closest approximation to what death is like. One second you're there, and the next you're not. It wasn't bad or scary or painful or anything. It was just existence and then nothingness and then the feeling of coming back online realizing what happened.
And when I was coming back online, my thinking was: Well, I'm glad to be back! And if I hadn't come back, would I have even noticed? (The answer is no).