winter depression; winter blues
Refers to seasonal affective disorder (SAD) with onset in winter; a common term in everyday and medical contexts.
Symptoms of winter depression include low mood and oversleeping.
When daylight hours become shorter, one is prone to winter blues.
Common mixed kanji-kana spelling; うつ is usually written in kana for this word.
Full kanji spelling; 鬱 is a complex character and often avoided in everyday writing.
Compound of 冬季 (winter) and うつ (depression), a straightforward modern coinage for seasonal affective disorder in winter.