I think I already know the answer, but a friend of mine disagreed with me on this point: If I were to become light, i.e. my consciousness was transferred to a photon moving with speed c, would it then seem to me as if I existed outside of time? I think it would because of the fact that moving clocks seem to travel slower. If you do a time dilation calculation you get the time interval in the moving system to be infinite compared to the proper time interval. It seems to me as if you would paradoxically experience two different things: 1. The universe would stand still (i.e. time would stop) for the rest of eternity. 2. All events in the future would happen instantly.