Sleep deprivation and stuttering

Sleep deprivation and stuttering 25 year old stuttering journalist here. Looking back on my time in uni, and all those occasions where I spent 30-plus hours working on essays through the night, I remember being stunned by the level of fluency I would achieve afterwards. Has anyone else experienced this, and what could have caused it? The euphoria at hitting a massive deadline? The sleep-deprivation-induced high?