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IELTS Preparation and Practice Reading & Writing - General Training
result in a 20 per cent-32 per cent increase
in mistakes and 14 per cent increase in time
needed to perform a task-not great if you're
aiming for a promotion or working with heavy
machinery.
6
Virtually all levels of sleep deprivation
adversely affect your mood. Losing a few
hours may result in negative mood states,
stress, loss of vigour and confusion. Some
people even report anxiety, depression and
increased moodiness. To keep your friends
and family onside, you may need to increase
your sleep duration.
7
As if things weren't bad enough, our 24/7
lifestyle could also be making us fat. Studies
have shown a negative relationship between
body mass index (BMI) and sleep duration
meaning the less we sleep, the higher our
BMI. The lack of sleep affects timing of the
release of some hormones, including leptin
and ghrelin, which suppress and promote
appetite respectively. Sleep deprivation may
lead to more munching and an expanding
waistline. Evidence also suggests that
too little sleep increases your chances of
cardiovascular disease, type 2 diabetes,
respiratory disorders and premature death.
8
How much do we need? This is a question
that still puzzles scientists. The standard
answer is seven to eight hours a night,
but the truth is more complicated. As with
so many things, our genes largely dictate
how much sleep we need and our sensitivity
to sleep deprivation. Some people can
tolerate large deficits with few problems,
while others struggle with the loss of a
couple of hours. The key is to know your
body and get the right amount of sleep
for you.
9
At the NYU Sleep Disorders Center, New
York City, Dr David Rapoport coordinates
the Sleep Research Program. One test they
perform has the patient pressing a button
every time they see a light flash, to test
their alertness and reaction time. Many of
his sleep-deprived subjects perform poorly
at this exercise-they stop responding and
then fall asleep in the chair. While this test
may sound quite straightforward, it actually
illustrates something very significant. 'We
don't fall asleep if we are well rested,'
says Rapoport. 'If you're falling asleep in
boring situations, that is a sure marker you
are not getting quite enough sleep.' So the
next time you fall asleep during a dull film,
remember this may say more about you
than the skills of the director-it could be
your body's way of telling you to hit the
hay more often.
Source: Choice.com.au
I
The reading passage has nine sections, 1-9. Choose the correct heading for each section
from the list of headings below. Write the correct number in boxes
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