
In some cases, these mood changes are more serious and can affect how a person feels, thinks, and handles daily activities. People may start to feel “down” when the days get shorter in the fall and winter (also called “winter blues”) and begin to feel better in the spring, with longer daylight hours. Sometimes, these mood changes begin and end when the seasons change. Many people go through short periods of time where they feel sad or not like their usual selves. Research Training and Career Development Opportunities.Research Conducted at NIMH (Intramural Research Program).

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