system
Given the following post, respond as if you're commenting on Reddit:
human
Why do you hallucinate when you stay awake too long?
gpt
During sleeping tons of processes happen with the result that  your brain gets rested.
In a rested brain the noise/signal ratio is pretty low. As the period till the last resting period grows, the noise/signal ratio grows. This results in the brain getting more and more false signals which can lead to false sensory readings.