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Nghe bai tai day:http://www.bbc.co.uk/worldservice/learningenglish/general/sixminute/2009/03/090324_6min_sleep_page.shtml
A Good night's rest





Do you get enough sleep?



March is National Bed Month! Getting enough sleep is vitally important for our overall health and well-being. Surprisingly though, many of us don't get anywhere near the recommended eight hours and two thirds of us say we get less sleep than we did a few years ago. Join Kate and Rebecca as they find out how we are affected by not getting enough rest.

This week's question:
Listen to the programme



A good night's rest


(Theo BBCVietnamese.com)

• 
  

What is the longest time someone has managed to go without sleep?
a) 20 days
b) 11 days
c) 3 days

Listen out for the answer at the end of the programme!
Vocabulary from the programme



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sleep deprivation
the condition of not having enough sleep

to sleep in
to sleep longer than usual

tempers are very frayed
get easily angry

tetchy
to be irritable, easily angered or upset

concentration
the ability to think clearly and carefully

vigilance
to pay attention and to notice things, especially possible danger

hostile
to be unfriendly and likely to be disagreeable

obesity
the condition of being very overweight or fat[flash][/flash]