As the clocks go back and winter finally beds in, we can start to feel the effects of the changing seasons both physically and mentally. Sometimes this manifests as feeling low or going into hibernation mode, but for some, it's more serious and can manifest as a specific type of depression called Seasonal Affective Disorder (S.A.D for short) this can cause anxiety, feelings of hopelessness and overwhelm, problems sleeping, low energy, loss of interest in life, changes in appetite and weight and even suicidal thoughts. It is thought as many as 1 in 15 people in the UK suffer SAD and research suggests this could be caused by a lack of vitamin D affecting serotonin and melatonin levels and disturbing the circadian rhythm. But what can we do and how can mindfulness help?