The onset of winter brings with it a type of depression called the seasonal affective disorder or SAD. This is a type of depression that seems to grip people in winter months as they begin to experience unexplained fatigue.
The onset of spring and summer relieves these symptoms. It is thought that SAD is caused by the decreased daylight exposure as days are normally shorter in winter. Researchers have said that two chemicals called melatonin and serotonin may be involved in SAD.
Some of the symptoms include loss of sleep, tiredness, fatigue, depression, crying spells, irritability and trouble concentrating.
The best way to prevent SAD is to take walks during the day or go to warmer sunny climes on vacations. Antidepressant medications can also help.