system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:If sensations, such as pain, can wake us up from sleep, why can't they wake us up from states such as comas?

I know it's the brains way of telling us to wake up because it thinks our body is under attack, but why doesn't the same happen when we're in a deeper state than sleeping?
gpt
Think of your brain as a computer. 

If a computer goes to sleep, you can move the mouse or tap the keyboard to wake it. If a computer crashes (goes into a coma) you can tap the keyboard and shake the mouse all you want, but until the computer reboots it will not work, because although it looks like it's asleep, it's not.