According to NHS , symptoms of SAD include: 

A persistent low mood 

A loss of pleasure or interest in normal everyday activities 

Irritability 

Feelings of despair, guilt and worthlessness 

Feeling lethargic (lacking in energy) and sleepy during the day 

Sleeping for longer than normal and finding it hard to get up in the morning 

Craving carbohydrates and gaining weight 

How to deal with SAD 

There are a few different treatment options available for people experiencing SAD. Before you invest in a lgiht therapy box or start taking supplements, speak to your general practitioner, who will be able to help you find an approach that works best for you. They will likely ask you to make some of the following changes:

Light Therapy( also known as Phototherapy )

When it's overcast and rainy, it can be difficult to get the amount of dayligh you need, especially since standard light bulbs, don't quite match the intensity of the sun.Enter the light therapy box, a ligth designed to minic the intense brightness and spectrum of sunlight , typically available with a rating of 10000 lux. 

Light therapy boxes are best used early in the morning for a minimum of 20 to 30 minutes daily. Keep the light near your face and at eye-level, but avoid looking directly at it. Some people like to read the paper or eat breakfast while using their lamps. 

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