Light exposure can help relieve winter depression  Researchers have took a study on nine patients, all of whom suffered from winter depression due to shorter winter days  The researchers asked the patients to receive three hours of a strong light exposure with companionship of floral fragrance in the morning and evening  Within a week, seven patients were completely free from depression, and the other two also showed significant improvement
All experiments are carried in the temperate climate of the northern hemisphere, and the experimental differences between the northern and southern hemispheres cannot be distinguished, but it cannot be ruled out in advance.
 Because the light can induce the body to believe that  summer is coming, this cures winter depression