Have you always been this way, or have there been points where there was a "gate" between thoughts and actions?
I get to be 100% impulse like you say the more sleep-deprived I am. Well, specifically if I stay awake past 2 am, I think the 2-4 hour is crucial in maintaining whatever processes curb impulsiveness and allow self-reflection. I haven't slept during that time for two weeks and I am starting to feel very uncontrolled also and it's nota good feeling. Also, even if you do sleep during that time, it might be poor-quality sleeep... I wonder if you could talk to a sleep expert about this. I don't know the scientific specifics but there is a clear link between sleep and the self-reflective function (the same way that sleep deprivation causes the same behavioral inhibition as alcohol).