The answer to this is Diagnostic. It helps the doctors test the patient to see if he/she has cancer because having too much white blood cells could cause cancer or certain types of diseases. Plus the doctor would use a blood lab work in order to determine how much the person has white blood cells in the patient's blood. The lab could also test how much the patient has red blood cells in the blood.
A few things can include taking a hot shower before bed, make sure you've completed everything you needed to do for the day, and go to bed on the right time, a bad habit would probably be staying up late to watch a movie or something
