If you are not a coffee lover and you lack caffeine, I recommend this. Natrol Guarana works for me because it keeps my concentration and gives me back my energy during studying.
Natrol High Caffeine Energy Support
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i really appreciated changing the "softness" of the color of the light through out the day. The step brightness is also helpful as well especially while I am studying at my desk in the daytime compared to the night.
KOOTION 12W Desk Lamp 72 LEDs White Table Light Home or Office Work - Walmart.com