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　　很多人起床时会把闹钟定得很早，被叫醒后再抓紧睡个回笼觉。但近日美国《预防》杂志指出，闹钟响过几次后才起床的人，醒来后反而更不清醒。

A lot of people get up when the alarm clock to wake early,A cage again after being waked up to sleep.But recently the United States[To prevent]Magazine pointed out that,Alarm clock didn't get up after a few times,Don't wake up instead more awake.

　　闹钟反复响打乱正常睡眠周期 The alarm clock rang repeatedly disturb the normal sleep cycle

　　“其实并没有这个必要。我不赞同这种做法。有些人睡眠偏晚，就要依靠后面的时间完成高质量的睡眠。如果人们是自然醒来，距起床还有一段时间，是可以补回笼觉的，但刻意通过闹钟提早叫醒是没有必要的，因为睡眠是一个自然的过程没有必要刻意打断。”宣武医院神经内科副主任医师詹淑琴告诉记者。

"In fact and don't have the necessary.I don't agree with this approach.Some people sleep too late,Will depend on the back of the time to complete the high quality of sleep.If people are naturally wake up,Get up from a period of time,Is can repair back to sleep,But deliberately through the alarm clock to wake up early isn't necessary,Because sleep is a natural process there is no need to deliberately to interrupt."Xuanwu hospital neurology, deputy director of the physician ZhanShuQin told reporters.

　　詹淑琴进一步解释，闹钟响时人体可能处于深睡眠时期，此时大脑比较疲劳，醒来后不太清醒。闹钟响过几次后起床，容易导致睡眠质量不好，而且再次入睡不一定能完成一个完整的睡眠周期。如此反复，人体并未完成正常的睡眠周期，完全有导致起床后不清醒的可能。

ZhanShuQin further explanation,Alarm clock rang the body may be in deep sleep period,The brain is tired,Wake up is not very clear.Alarm clock rang a few times after get up,Easy to result in a sleep quality is bad,And fall asleep again can not sleep to complete a full cycle.So again and again,The body did not finish the normal sleep cycle,Have to wake up the possibility of not awake.

　　三个“一分钟”有利于从睡眠状态中恢复 three"A minute"To recover from sleep

　　另外，对于一些市民较熟悉的三个“一分钟”，即人醒来后在床上躺一分钟；起床之后在床头靠一分钟；起床后双腿下垂等一分钟，詹淑琴指出，这是比较好的做法。

In addition,For some people is familiar with the three"A minute",The people woke up in bed in a minute;After getting up in the bed in a minute;After getting up, legs, such a minute,ZhanShuQin pointed out that,This is a good practice.

　　醒来之后等一分钟，这段时间可以使人体及大脑皮层逐步清醒，使人体在起床后处于觉醒状态。如果大脑皮层清醒，但人体尚未清醒，身体有可能会发软。另外，起床后，由于人体血压尚未调节好，可能会因供血不足而晕倒，特别是有些老年人或身体比较虚弱的人。人体的反应是需要一定时间的，在人体未充分觉醒时，身体的保护性反应比较差，血供应不足，大脑可能处于短暂的缺血状态。这也是为什么很多人在未完全清醒的状态下大小便有晕倒的可能。人在睡眠时，呼吸、血压、脉搏等都处于比较低的状态，体温也会比正常情况下低1-2摄氏度，人体代谢也偏低，这一分钟可以为人体逐渐恢复正常状态提供时间。

Wait a minute after wake up,This period of time can make human body and the brain cortex gradually awake,Make human body after wake up in a state of awareness.If the brain cortex,But the human body has not yet awake,The body may be feeble.In addition,After getting up,Because the body not adjust good blood pressure,May be due to insufficient blood supply and faint,Especially some old people or the body is weak.The response of the human body is need certain of time,When the body not fully awake,Protective reaction of the body is poorer,Insufficient blood supply,The brain may be in a state of ischemia.This is why a lot of people are not fully awake under the condition of urine a faint possibility.People during sleep,breathing/Blood pressure/The pulse and so on all is in a state of relatively low,Body temperature will be low than normal 1 to 2 degrees Celsius,Human body metabolism is also low,This minute can provide time for human gradually returned to normal state.

　　人体从睡眠时的躺着到坐着，再到起床后的站立，从各种人体机制来看，人体尚未完全从睡眠状态中转换时，双腿下垂一会儿，或手脚活动等，有利于机体的全面清醒，避免一些突发事件。新京报记者 张秀兰

The human body from the sleep lying to sit,Stand to wake up,From all kinds of human body system,The body has not been completely when converting from the sleep state,Drooping legs for a while,Or activities,Is beneficial to the body's fully awake,Avoid some emergencies.The Beijing news reporter ZhangXiuLan