Brian Weatherson asks Thoughts Is Hibernation Time Travel? While simply sleeping or otherwise being unaware of the passage of time seems clear to him not to be time travel, he's not so sure about processes like hibernation or freezing that slow down relevant processes and not just the subjective passage of time. I have to wonder, though, why advancing through time normally according to your frame of reference would ever be considered travel at all. A hibernating bear or a cryogenically suspended Phillip J. Fry is still advancing (if that's the word) through time at the exact same rate as everything else around them--only the rate of decay and dissolution has changed but that doesn't seem much like travel at all--if anything the opposite. I know the intuition is that subjectively it's as if they had travelled over the intervening time rather than through it, but since the whole discussion begins with recognizing that subjective experience (at least in the case of deep sleep or a wandering mind) isn't a reason to regard something as time travel, what's left to suggest otherwise?