This experience is called nighttime depression, which isn’t a medical condition on its own. Myth #1: Nighttime Depression Is a Mental Health ConditionFact: Nighttime depression isn’t a separate type of mental health disorder. Myth #4: Nighttime Depression is Always Caused by Poor SleepFact: Sleep problems and nighttime depression often go hand in hand, but they aren’t the same thing. Myth #5: You Have to Forever Live with Nighttime DepressionFact: Nighttime depression is treatable. While occasional low moods are part of being human, persistent sadness that shows up night after night deserves attention.