Human beings are not like some animals. We are supposed to be awake during the day, and asleep at night. Most lights in our houses are brighter than they should be. Doctors say that the brain gets confused as it thinks you should be wide awake when you should really be fast asleep. Try to avoid very bright lights just before you go to bed. One simple solutions is to install a special switch that enables you to choose exactly how bright you would like the light to be.