Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 39 to 43.
Umeå, in Sweden, is only 500 kilometres from the Arctic Circle, which means that from October to February it only gets between 42 and 45 minutes of sunlight every day. And that's only if it isn't raining when, depressingly, it may never get light at all.
But students at Dragonskolan, an upper secondary school in the city, are getting a lot more sunlight than that this year, even if it is artificial sunlight. They are part of an experiment to discover if brightly electric light can make a difference to students' well-being and performance. When we are exposed to light in the morning, the brain takes it as a signal to stop producing melatonin, the hormone that makes you want to sleep. If you don't get any light, the body delays producing the signal that it's time to wake up. Over time, you basically get a kind of 'jet lag' where your body clock is not set correctly for the time of day.
The hope is that by exposing students to a bright light all day, they will be less sleepy during the day, and get a better rest at night. They should also be less likely to become depresseD. It will be interesting to see the results.
(Adapted from Navigate)
