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When I am tired and I get angry anything can add to that anger. Like someone chewing with their mouth open can increase my anger when I am tired, but when I am fully awake I can just shrug it off and not be bothered by it.
Yeah, totally normal. When I'm at my tiredest (like no sleep all night) I get annoyed at things like strands of my own hair touching my face.
It's pretty normal to be more sensitive when tired; some people cry, some get more irritable, demanding, pick fights... I think in the end it all boils down to having a basic need unfulfilled. Same thing happens to others when they're hungry. Similar to babies who react to not getting enough sleep or food when they need it.
Yes a sign of sleep deprivation is irritability. There is other signs you will start to notice as well like memory issues and sometimes hallucinations have been reported.
I either get grumpy or deliriously happy and silly. I think it depends. If I'm physically and mentally tired - grumpy. If I just haven't slept well (which is normal for me) I am in a silly mood.