system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does an extreme lack of sleep seem to temporarily change an individuals mannerisms and personality?

For example, if I go a very extended length of time without sleeping and I'm at a point where I don't feel tired at all, I've noticed I tend to get a bit "goofy" with how I act. I've also noticed that I have less of a filter and will verbally respond to things much differently than I would otherwise.  
&nbsp;  
Very interested to hear your explanations, as I'm currently at this point right now.
gpt
Mood and sleep are linked. When you are overly tired, you lose some abilities to regulate your emotions, so you feel more emotional extremes than usual.

At the same time, sleep deprivation causes the same kind of impairment as alcohol intoxication. So you subjective understanding of what you are experiencing isn't necessarily as accurate as if you were not sleep deprived (or drunk).