Once winter hits, it always feels like being completely sealed under the covers. The alarm clock serves only as a reminder to sleep in a different position, filling my head with I don’t want to get out of bed! I don’t want to get up! I don’t want to get up! But in fact, the bed-ridden this “pot”, the comforter is not willing to take the blame. The real cause of your deep in the nest sleep can not wake up may be winter depression. What is winter depression? Sleeplessness, inefficiency, lethargy, fatigue and sluggishness, these may be the manifestation of winter depression. Once the winter months roll around, some people suffer from Seasonal Affective Disorder, also known as SAD, which is a more severe form of depression. In the U.S., the prevalence of SAD is close to 10 percent, and in the worst case scenario, it can even cause suicidal tendencies. And as soon as the coming spring begins, these people with SAD become refreshed and energized again! It’s not the alarm clock that wakes me up, it’s the light! Light, may be an important factor in SAD. Morning light is nature’s alarm clock, which triggers the pineal gland in our body to suppress the secretion of melatonin (the hormone that stimulates the body to sleep) and ensure our normal biological clock routine. However, in winter, when the light becomes weak, melatonin continues to be secreted, making the body think that it is still nighttime, leading to the dysfunction of the biological clock and triggering SAD. Eating makes people happy, scientifically! Eating makes people with SAD happy, and it’s also carbohydrate-rich foods that stimulate mood-enhancing chemicals. People’s emotional highs and lows are regulated by the neurotransmitter pentazocine. While no key link has been found between light and pentazocine, one study found that people with SAD who have higher levels of the pentazocine transporter protein (SERT) have fewer mood-enhancing neurotransmitters and are more likely to experience depressive symptoms. Sleepy? Mourning? Then let’s get some light! Simulating natural light from outside is the most versatile non-invasive treatment for SAD, helping people to re-regulate their biological clocks and alleviate sadness through the use of light therapy boxes. In Sweden, in order to overcome the darkness and depression brought about by the long winter, bus stops are directly transformed into UV therapy boxes to provide sunlight therapy for the public, after all, happiness is the most important thing! If one day suddenly and inexplicably bereaved or filled with resentment do not want to get up, then go to the sun more ~ let yourself awake a little! Of course, if the situation is serious, you should see a doctor.