2. Open windows
In the morning, it is useful to let in not only the sun’s rays but also fresh air into the room. When you wake up, do not forget to open the window and ventilate the bedroom.
Airing is useful even in the winter season: the frosty air will invigorate, energize and help you wake up as quickly as possible.
Summer sun rays will accelerate the production of the “happiness hormone” and vitamin D.
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