After 24 hours without sleep: Vision is a bit blurry, things are slightly out of focus, eyes are somewhat sunken in, and eyelids are noticeably heavy.
After 48 hours without sleep: Begins to feel as though your in a dream like state; things seem a little "surreal". Mind is somewhat fogged. You start to occasionally have small and obscure shadow hallucinations out of direct eyesight.
After 72 hours without sleep: The "dream state" feeling is no longer subtle. Thoughts grow more scattered, it becomes hard to process, and articulate things. Larger shadow hallucinations, and occasional vivid hallucinations in direct sight become more frequent the longer your body and mind are deprived of sleep.
I stayed awake for 72-84 hours and had a mental breakdown hysterically shaking and crying in front of my friends because I was seeing the same "demonic" looking figure with red eyes everywhere continuously for 7-8 hours watching me, and my hallucinations had become so vivid I couldn't distinguish the eerie sightings from reality, I was literally in fear for my life. Get some sleep. Taking a stimulant while your running on no sleep is a waste of speed, the only effect it will have is keeping your exhausted eyes open, no euphoria, no motivation, no tweak. Save it for the next day