system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: why do we lose our sense of time when anaesthatized but not when sleeping?

Like when you are anesthetized you fall asleep then wake up and it feels like its instant and have no sense of how much time has passed. But when you wake up from sleep you often know roughly how long you have been out.
gpt
Because you're somewhat conscious when asleep,  sounds and touch and pain can stir you to full awareness.   Unconscious is completely out,  nothing -  not even pain,  which is entirely the point of anesthetics - will make you fully conscious from that unconscious state.