My grandmother recently got a endoscopy and was put under anaesthesia. I asked her what it felt like to go out and then re-waken and said she almost didn't even notice it. They told her "okay you're done"in what felt like seconds of being put out. This got me thinking about cryonic hibernation and cryonic reanimation. If there truly is a way to put humans in cryosleep to travel long distances in space; when they wake up, will it be the same feeling? A brief second of lapsed time or will it be like a long sequence of non-REM sleep? In Alien: Romulus, the survivors went into stais for 9 years to get to another colony planet. Also people who have "died" and were frozen. We don't know if we can ever resurrect them but if it's possible; due to how time perception works; have they "already" woken up?