Disruption to sleep

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  • Created on: 09-06-13 14:39
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This term is used for general travel, not just aeroplanes. It occurs because the Dorsal
section of the SCN is adapting to change which can take several sleep cycles.
Easier to stay up late than to get up really early
Loss of appetite
Mild depression
Flying East (NY to London) Flying West (London to NY)
Difficult to cope with Easier to cope with
Blakemore (1988) evidence suggests that melatonin supplement pills taken in the
evening may reduce the effects of jet lag.
Individual differences each person will cope with jet lag in a different way so we
cannot generalise this disruption to everyone.
This is a type of winter depression which is estimated to affect half a million people between
December and February. Onset is usually between 1830 years of age.
It is caused by a biochemical imbalance in the hypothalamus due to a lack of sunlight hours.
For many people it is a serious illness which prevents
them from functioning on a day to day basis. For other
people it causes discomfort but not severe suffering.
A diagnosis can be made after several winters of the
following symptoms:
Sleep problems disturbed sleep and early
awakening. Also a desire to oversleep.
Lethargy feeling of fatigue and inability to carry out your normal daily routine.
Overeating cravings for sweet and fatty foods which often results in weight gain.
SAD symptoms disappear over the Spring, either suddenly or gradually over a short period
of time.

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This often results in sleep deprivation and therefore can affect alertness throughout
the day. It has also been found that it leads to poor health according to a CBS report.
It can lead to fatal mistakes e.g. Chernobyl.
Many people work when their internal body clock says they should be asleep. Our body clock
has an important job and prepares us for sleep when it is dark, particularly between 24am.…read more


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