Home > Newsletters > Daily: Love or hate Earth Hour? > Daily Dose: 'We could see her lungs through her skin' > Health-in-Motion Updated 02 March 2016 Light therapy for depression If lack of sunlight contributes to seasonal affective disorder, then getting more light may reverse it. Bright light works by stimulating cells in the retina that connect to the hypothalamus, a part of the brain that helps control circadian rhythms. Activating the hypothalamus at a certain time every day can restore a normal circadian rhythm and thus banish seasonal symptoms. Light therapy entails sitting close to a special “light box” for 30 minutes a day, usually as soon after waking up as possible. These boxes provide 10,000 lux (“lux” is a measure of light intensity). That’s about 100 times brighter than usual indoor lighting; a bright sunny day is 50,000 lux or more. You need to have your eyes open, but don’t look at the light. 0 More: Daily Dose: 'We could see her lungs through her skin' Health-in-Motion advertisement Other news Lifestyle What drinking 8 or more beers a week does to your brain Fitness This rape victim is helping survivors worldwide Partner Content Bringing life-changing tech to SA healthcare countrywide Fitness The 5 biggest mistakes made by weightlifters Diet and nutrition Are you making this huge weight-loss mistake? Lifestyle Everything you need to know about bone density tests From our sponsors Discover treatments that can help reduce acne Dementia and Incontinence: what you need to know Fill in our quick and easy survey and stand a chance of winning a R2000 voucher! What can I do to reduce or remove acne marks? Live healthier Watch out! » Gross fungal infections you can pick up at the gym You go to gym to exercise. But make sure the only thing you pick up is a dumbbell and not one of these gross fungal infections. Holiday health » Your 10-step asthma holiday checklist Don’t let asthma ruin your summer holiday. Whether you are travelling or embracing the summer at home, make sure you plan ahead.