How long into the night can you study?

I used to be able to stay up till 4am in the morning and sometimes not even sleeping when I was a teenager. My age is catching up on me and I now try to sleep by 3am or wake up by then. When I go without ample rest, I muscles get tired and numb very easily. The acid builds up a lot faster then. Sometimes I experience a loss of appetite. Not an enjoyable feeling.

yeah i am alil bit but normally it depends on how busy my day was! sometimes i am unable to stdy at all and sometimes i study alot happy lottin n have a nice day!

I sometimes study till 5:30 am in the morning in my exams and my paper starts at 9 am so it is about less than 3 hours for me to sleep because i have to reach their half an hour before.

I often study up to 4.30am in the morning if i have exam that start at 9am. I will usually wake up around 6.30/7.00am and take bath before going thru one las time before going to the examination hall. Sometimes if i m under prepared the sleep time will reduce to not more than 30 minutes.

i am a one day batmen before exam i will work hard.but i will study perfect on that day because one day is enough to change our life fail or pass.But i wont take risk to study before 3 or 4 hours and starting from the first also increase our marks and life will be good...we should not take exams lite even though we have to enjoy and also study...

i have studied one day the whole night and gave the exam which was scheduled to 1100 am.there was a gap but i cannot manage to sleep because my college is some what 60 km from my house(mumbai suburban)/

Studying all night long just before the exam is students' way of life. Maybe other people wonder why not studying during class, but waking up during the night for hours to study make me excited. I guess my time limit for studying is 3 a.m. and wake up a couple hours later to contnue my study. I guess I'm just lazy

When I would stay up that long studying or for any other reason I would not be able to go to sleep at all if I had something to do that morning. If I did go to sleep I would miss whatever else I had to do that morning because I would not wake up.

Well you should know that you want to have a lot of sleep after long periods of study so that the brain can "soak in" all the information you have just learned. However your story is quite exciting xD. You must have been tired.