Why does light make me tired?

What is a thick white discharge that is not a yeast infection or an std? Is the heart positioned between the lungs in the thoracic cavity? Certainty of paternity influences the development of mating systems? What is the difference between the words sera and serum? Why sparks from a firecrackers a red hot yet they do not burn your skin? Can smoking a vapor pen cause COPD in get worse? What is the importance of the urethra? How come when testing for hiv with your patner and your patner test positive and you test negative? What is a t2 cortical lesion of the kidney? Does spironolactone cure STDs? Why would a vaccine be administered into the nasal cavity to protect the reproductive tract? Where did asthma originate? How long does it take to know if something is wrong when someone drawn blood and injected some air in my vain before drawing my blood? Xray record of the urinary tract? What are objectives for measles investigation? What bodily changes are associated with the sympathetic nervous system's response during stress? Why doesn't the acidity of orange juice disrupt your blood? What are the symptoms of bubonic plague? Who invent dialysis? What can cause canine digestion problems?