system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is it that you never think anything is weird when you are dreaming, it's only when you wake up you realise how strange things actually were?
gpt
To be brief, during a dream it's basically your brain taking a rest. So like a computer it shuts off all non-essential functions, and one of them is called the dorsolateral prefrontal cortex. This part of the brain controls things such as memory and judgement. Thus, without this part of the brain "on" you lose the ability to a) remember the real world and b) judge that the dream you're in is weird.    
On top of that, a dream is only weird because it doesn't usually follow the same laws of science that you're used to in reality. So after waking up it might be weird, but during the dream without the ability to recall the "true" laws of science, you don't think it's weird.