Actually this is an age-old question with no clear-cut answer, there are pros and cons to both studying at night and studying during the day.
You need to check out this article!
^They list out the pros and cons of each, as well as offer some tips on how to beneficially study during the night and day.
Also, take a look at some of our blog posts for further study tips and tricks:
6 tips to organize your life and studying
25 techniques to help you study
Rip off that studying bandaid in the library