Quote Originally Posted by Pure
and what do you mean by mental state?
I mean you may not actually be physically tired, but your mind wants you to rest so you do.
You sit down for a minute or two and you go into relax mode then you go "ah, bugar it im all tired now" But if you keep on working, hard, it doesnt give you chance to rest or your heartbeat drop, so your body wont want to stay there.

I just woke up so im confusing myself ill elaborate later if that sentence makes no sense?