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k)The reason we need sleep isn't yet understood by scientists.
Scientists don't yet understand the reason we need sleep.
j)An audio track of the exam material was being played by some students while they were sleeping and they remembered the material better.
Some students were playing an audio track of the exam material while they were sleeping and the material was remembered better.
i)Sleep might be disturbed by TV, computer games and exercising if these are too close to bedtime.
TV, computer games and exercising might disturb sleep if these are too close to bedtime.
h)Sleeping during the day will make sleeping at night much more difficult.
Sleeping at night will be made much more difficult by sleeping during the day.
g)While we are sleeping, information about what was going on during the day is being sorted and processed by our brains.
While we are sleeping, our brains are sorting and processing information on what was going on during the day.
f)In 1964, the world record for not sleeping was set by 17-year-old Randy Gardner when he was awake for 264 hours and 12 minutes.
In 1965, 17-year-old Randy Gardner set the world record for not sleeping when he was awake for 264 hours and 12 minutes.
e)While adults are sleeping, they are having dreams on and off for an hour and half to three hours.
Dreams are being had on and off for an hour and a half to three hours while adults are sleeping.
d)A person can only dream dreams about faces which he has already seen.
Dreams can only be dreamt about faces which have already been seen.
c)Some people, who had only watched black and white TV as children, reported that they had had dreams in black and white.
Dreams in black and white had been reported by people who watched black and white TV .
b)On joining the European Union, Spain launched a campaign to get rid of its world famous siestas.
A campaign to get rid of its world famous siestas was launched by Spain.
a)Bizarre plots and lots of imagination characterise REM dreams.
REM dreams are charactiresed by bizarre plots and lots of imagination.
