What do you name this peculiar feeling after Christmas ?

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Perhaps English is the only language which incorporates many new words from non- English languages into its dictionary every year. Now, while we are still in the Christmas week I wonder what this peculiar feeling that most of us have it. These days between Christmas and the New Year Day bring a peculiar feeling. The joyous spirit, the songs and dances, the cakes and dinners, and beers and wines and what not! These noise and music have suddenly subsided. We are tired and don't feel like doing anything! Does any word in your language disc tive word to express such a feeling ? Suddenly, I discovered a new words in Nordic language . I wonder if they are many such words taken from other languages ! Someone today gave me a challenge. He asked how to pronounce this word - haggye.