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Well according to studies it is better to study at night because if you wake up early in the morning to finish up work, you have less blood sugar in your body at that time. This means you would have a harder time trying to think and concentrate and will probably want to fall back asleep. While studying at night will help you retain information better,due to when you study during the morning, you are then distracted by other things making it harder to retain information. And when you study at night you will not have any other distraction other than your dreams. Although this may not work for everyone, it is proven to work for the majority.