For people with depression, feeling tired is an all-too-common symptom. Business Insider reports on the ways this mental health issue can make people feel sleepy.

“Tiredness or fatigue is one of the hallmarks of depression,” says Amy Ricke, MD, of Your Doctors Online. 

With depression, energy levels dip, and many of the symptoms, such as profound sadness and loneliness, can further exacerbate fatigue. Here’s why depression makes you tired, how to tell if it’s the cause of your fatigue, and how you can feel more refreshed and well-rested.

Depression is likely associated with changes in brain neurotransmitters, such as dopamine, norepinephrine, and serotonin. “These neurotransmitters play important roles in regulating energy levels, sleep, appetite, motivation, and pleasure,” Ricke says. 

According to Harvard Health Publishing, depression is a complex disease with many possible and interlinked causes, including genetics, medical conditions, stressful life events, and brain chemistry. And it can be challenging to tell the difference between everyday tiredness and depression-related fatigue. 

Get the full story at insider.com.