A survey by the University of Leeds found that a 25 per cent of people get less than five hours' sleep a night.
The researchers also noted a distinct mismatch between how much sleep people intended to get - or thought they needed - and what they actually got.
YOU GET EVERY COLD AND VIRUS GOING
People who sleep for less than six hours a night are four times more likely to come down with a cold than those sleeping for seven or more hours.
'Sleep deprivation has a negative impact on the immune system.'
White blood cells called lymphocytes don't reproduce effectively when we're sleep deprived.
JOKES ARE LOST ON YOU
Scientists in the U.S. found that we lose our sense of humour when we're tired, because finding something funny is one of the most complex brain processes.
YOU SOUND LIKE A ROBOT
Sleep experts say a 'tired' voice tends to sound flat and monotone. This is because the muscles in the throat that govern the sound of our voice are not as well controlled when we're tired.
ACHES AND PAINS SEEM WORSE
A common test for pain tolerance is to see how long someone can keep their hand in cold water. Those with insomnia removed their hand earlier than those sleeping well.
ALCOHOL GOES TO YOUR HEAD
'It's been estimated that a unit of alcohol drunk when someone is sleep deprived will have the same effect on performance as three units consumed when someone is fully rested'.
PEOPLE TELL YOU TO CHEER UP
As we're less able to control our muscles when we're sleep deprived, our face droops meaning others may think we look sad.
YOU EAT MORE THAN USUAL
When researchers at the University of Colorado Boulder in the U.S. asked people to reduce their sleep to just five hours a night and left them with easy access to snacks during the day, they gained an average of 2lb in just one week.
'Sleep loss is almost the perfect storm for over-eating and weight gain'.
YOU FORGET KEY INFORMATION
Poor sleep is known to affect memory function. Experts suspect that sleep is a time when we consolidate memory, with the brain working out which of the events of the day we need to recall and which can be forgotten.
YOU FEEL SLEEPY AT ELEVNSES
Feeling sleepy after lunch is not a sign of sleep deprivation, says Dr Stanley. 'That's normal and related to the body clock and a natural fall in body temperature that occurs at this time.' However, feeling like you could nod off at 11am is a sign you need more sleep.
The researchers also noted a distinct mismatch between how much sleep people intended to get - or thought they needed - and what they actually got.
YOU GET EVERY COLD AND VIRUS GOING
People who sleep for less than six hours a night are four times more likely to come down with a cold than those sleeping for seven or more hours.
'Sleep deprivation has a negative impact on the immune system.'
White blood cells called lymphocytes don't reproduce effectively when we're sleep deprived.
JOKES ARE LOST ON YOU
Scientists in the U.S. found that we lose our sense of humour when we're tired, because finding something funny is one of the most complex brain processes.
YOU SOUND LIKE A ROBOT
Sleep experts say a 'tired' voice tends to sound flat and monotone. This is because the muscles in the throat that govern the sound of our voice are not as well controlled when we're tired.
ACHES AND PAINS SEEM WORSE
A common test for pain tolerance is to see how long someone can keep their hand in cold water. Those with insomnia removed their hand earlier than those sleeping well.
ALCOHOL GOES TO YOUR HEAD
'It's been estimated that a unit of alcohol drunk when someone is sleep deprived will have the same effect on performance as three units consumed when someone is fully rested'.
PEOPLE TELL YOU TO CHEER UP
As we're less able to control our muscles when we're sleep deprived, our face droops meaning others may think we look sad.
YOU EAT MORE THAN USUAL
When researchers at the University of Colorado Boulder in the U.S. asked people to reduce their sleep to just five hours a night and left them with easy access to snacks during the day, they gained an average of 2lb in just one week.
'Sleep loss is almost the perfect storm for over-eating and weight gain'.
YOU FORGET KEY INFORMATION
Poor sleep is known to affect memory function. Experts suspect that sleep is a time when we consolidate memory, with the brain working out which of the events of the day we need to recall and which can be forgotten.
YOU FEEL SLEEPY AT ELEVNSES
Feeling sleepy after lunch is not a sign of sleep deprivation, says Dr Stanley. 'That's normal and related to the body clock and a natural fall in body temperature that occurs at this time.' However, feeling like you could nod off at 11am is a sign you need more sleep.
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