Light Precautions

Persons with manic-depressive illness are more sensitive to light than others.  Too much light causes manic symptoms, too little light causes depressive symptoms.  In the spring and summer there is too much light, in the fall and winter there is not enough light.  You thus need to modulate your light exposure to avoid causing mania in the spring and summer and depression in the fall and winter.  The mood episodes go together, so if you want to prevent winter depression, you should also try to prevent summer mania. 

For the fall-winter (September-January):

In the winter, there is not enough light.  Therefore you will sleep in the morning longer than you should, and that will throw off your circadian rhythms. You therefore need to increase your light exposure.

  1. Keep shades and curtains open at night, to maximize morning light exposure. 
  2. Do not wear sunglasses in routine activity, or use them less than you normally would (or limit only to driving).
  3. Go for walks around noontime, without sunglasses, for up to an hour.
  4. Go to bed at a regular time at night.
  5. Wake up at a regular time in the morning; use an alarm if you tend to oversleep.

For light therapy:

  1. Plan on spending $200-300.  No need to spend more
  2. The dose is 10,000 lux (most lightboxes are at that dose).
  3. There are many companies - Amazon may be an easy way to order.  
  4. Use indirect light; do not look into the light box directly (treat it like the sun). Have it on the table while you read or eat in the morning.
  5. Dose is 25- 30 minutes to one hour as long as depression persists.
  6. Use the lightbox daily initially, and then reduce use to every other day for prevention.
  7. Use the lightbox in the morning (before 10 AM): remember you are trying to replace the morning sunlight which goes away in the winter.

For the spring/summer (March-August):

In the summer, there is too much light.  Therefore you will sleep in the morning less than you should, and that will throw off your circadian rhythms. You therefore need to decrease your light exposure

        1. Wear sunglasses at all times.
        2.  Wear an eyemask to sleep.
        3.  If possible, get room-darkening shades and close them,  and close all curtains at night, to minimize morning light exposure.
        4.  Go to bed at a regular time at night.
        5.  Wake up at a regular time in the morning, but try not to wake up early.

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