I would have said that i don't stay up late at night but that will be very weird to say there's no one on earth if am not mistaken who doesn't stay up at night even the kids this days. They stay up at night, Now i stay up at night for a lot of reasons to be sincere, I do stay up at night because of my YouTube free night browsing and most times i stay up so i can post in leofinance community some times, I always stay up at night if i want to read not necessarily exams but most times if i want to understand what am reading i always want a quiet place, So i can understand what am reading.
It is in my nature like it is natural in me i don't really fall asleep like early, I always sleep around 2am sometimes even my mom will be complaining about me staying up late at night. Well i immune to my sleep trust me when i say this most times i don't even need any thing to stay away and again I do need something to resist me from sleeping sometimes and I'll shock you by telling what it is, lol what keeps me up at night is water, I know it's shocking LoL were am I going to see coffee at that time of the night.
If only we do stuck up our home with groceries then maybe coffee would have been the best for me to quench the sleeping while working. The truth is most times I don't need no coffee or water to stop me from dozing while trying to do whatever i do at night like i said i am immune to sleep most of the times and i almost thought i was having insomnia I did go to a doctor and complained, it was said I am okay, He said i was the one doing my body is fighting sleep and I was wowed.
So the answer to the question is i don't necessarily take anything to stay awake but when there is a need because there is saying that says “ Body no be fire wood” so I do use water to wash my face or have my bath then if there is a coffee available I can use that too and case settled sleep gone.