You can tremendously enhance the speed of your effective learning process by setting favourable conditions around you viz., cool temperature, sufficient good ventilation, aestheics, least dust (particulate matter), free of bad odours, etc. These factors I think keep you intact and may not distract you from your learning process.
Extremities from normal may drastically alter your behavior, your mood and your concentration. Incorrect lighting and other factors may make you feel either hypoactive (lethargic) or hyperactive (emotional), bored and stressed. You should have to take intermittent breaks from your studies. You could not be consistent at you job. Adverse situations may make your plans, methodologies, memory power, etc unmanageable and can even influence your results!!!
"Take care of your body with steadfast fidelity. The soul must see through these eyes alone, and if they are dim, the whole world is clouded." - Johann Wolfgang Von Goethe