WebMD explains conditions that might cause you to feel sluggish during the day, such as anemia, thyroid trouble, sleep apnea, diabetes, heart disease, depression, and menopause.| WebMD
How much do you know about introverts? Find out what it means to have an introvert personality, how to know if you are one, and learn about the different types.| WebMD
Dopamine deficiency has links to several health conditions, including Parkinson's disease and depression. Learn Symptoms of Dopamine ,What It Is, Function & how to boost it| WebMD