People who get precisely seven hours and six minutes of shut eye are perfectly happy， a new survey shows． We already knew that there's a strong link between the amount of sleep we get and our health．
Participants who considered themselves mostly happy people sleep a little bit less than the perfectly happy people， getting seven hours． And those who said they were somewhat happy for six hours 54 minutes， the study of 2，000 people shows． "Less than 6 hours 48 minutes of sleep meant complete unhappiness in relationships and constant worry．" the report states．
Compared with previous research， the new study found women struggled the most to get a decent night's sleep， and those reporting the fewest hours also said they were the least happy． But age is a big factors - the survey also found that those 25 younger get a lot of sleep regardless of happiness level．
People who got the best sleep were more likely to take a bath before bedtime． Activities associated with less sleep include working or playing video games， according to the report． One in three of us suffer from poor sleep， with stress， computers and mobile devices， work patterns taking work home often blamed．
And the price of sleepless nights is more than just fatigue（疲劳）． As well as sadness， lack of regular sleep is linked to raised risk of obesity（肥胖）， heart attack - and it shortens your life． However， while a lot of research tends to focus on the amount of time we sleep， scientists at Brigham and Women's Hospital have found routine is just as important． They discovered people who go to bed at the same time every night are far more healthy and successful than those not． It claims going to bed and waking up later on the weekends can raise your chances of getting heart disease． They gave the advice that people should follow their sleep routine．



Who will often feel worried when they wake up？ ______

A. People who sleep for 7 hours and 6 minutes．
B. People who sleep for 7 hours 20 minutes．
C. People who sleep for 6 hours and 54 minutes．
D. People who sleep for 6 hours 38 minutes．

What should people do to have a good sleep？ ______

A. drink milk
B. read books
C. surf the Internet
D. take a bath

What will people suffer from lack of regular sleep？ ______

A. Heart disease．
B. Net addiction．
C. The stomachache．
D. The cancer．

What did scientists at Brigham and Women's Hospital suggest？ ______

A. They should wake up late on the weekends．
B. They should reduce the amount of time．
C. They should get a long sleep on weekdays．
D. They should go to bed at the same time．