It is finals week at my school, so I've been having many late nights and a lot of caffeine. How does it affect my health? Gettin like 3 hours of sleep

Sleep and Memory. Sleep plays a role in memory. Take a look at the video clip on this link. You might rethink your study style. http://healthysleep.med.harvard.edu/healthy/matters/benefits-of-sleep/learning-memory.
? it is affecting your well being. Sleep deprivation has a long list of side effects that can be accessed on google. However, at your age it is highly unlikely that this bad for your body, such as heart, lungs and brain. We all went through this at one time in our life; and coffee is probably good for you. I certainly like my doble espresso!