为什么老年人需要较少睡眠?

2016-06-03 佚名 BBC

很多老年人都说自己睡眠有问题。几乎有一半的老年人称存在睡眠障碍,而四分之一到三分之一的老年人称他们被失眠困扰。他们的问题主要有两方面:一是晚上入睡难,二是早晨醒的太早,而且无法重新入睡。在一些情况下,某些疾病加剧了他们的睡眠障碍,但是很多人在没有身体不适的情况下,晚上也无法得到充分睡眠。缺乏睡眠可能会对免疫系统和身体健康的很多方面造成长期影响,还会导致白天的倦怠,并增加事故的风险。但是有可能随

很多老年人都说自己睡眠有问题。几乎有一半的老年人称存在睡眠障碍,而四分之一到三分之一的老年人称他们被失眠困扰。

他们的问题主要有两方面:一是晚上入睡难,二是早晨醒的太早,而且无法重新入睡。在一些情况下,某些疾病加剧了他们的睡眠障碍,但是很多人在没有身体不适的情况下,晚上也无法得到充分睡眠。

缺乏睡眠可能会对免疫系统和身体健康的很多方面造成长期影响,还会导致白天的倦怠,并增加事故的风险。但是有可能随着人年龄的增长,人只是不再需要那么多的睡眠,所以过多担心。

要确定不同年龄的人需要多长时间的睡眠并不简单。当然,你可以计算人们实际的睡眠时间,这样你会发现老年人平均睡眠较年轻人短,但这只能说明他们的睡眠短,并不能说明他们所需的睡眠少。

有时,人们会说老年人晚上睡眠少是因为白天经常会打瞌睡。不过,也有人认为白天非常嗜睡不应被认为是衰老的必然结果。


退休者的失眠情况医生并不总是认真对待。一项研究发现,69%的老年人称存在睡眠问题,但是其中81%的人病历上并没有注明失眠问题。

那么,假如我们设想一下老年人也需要相同时长的睡眠,那么为什么他们的睡眠时间短?一个假设是衰老的过程破坏了他们的生物钟节奏,导致他们较早醒来。研究表明生物钟似乎会发生变化,让人们早起晚睡。他们可能仍然需要睡眠,但是无法入睡,而且即使入睡了,睡眠质量也比不上从前年轻时。

俄罗斯最近对此进行了一次新研究,该研究让130个人在早晨去实验室,呆一天并在那里过夜。研究人员让他们时刻保持清醒,并定时让他们评价自己的困倦程度。白天和晚上的睡意各不相同。在这样的睡眠剥夺实验中,被试者会反映出与生物钟相关的身体变化,比如白天不同的体温变化和晚上的褪黑激素的分泌情况。

研究人员还在白天和夜晚测量了志愿者较慢的脑电波。然后分析所有这些数据,并与过去一周他们的睡眠日记对照,根据早起倾向者或晚睡倾向者的不同特点,分析睡意和较慢的脑电波的分布情况。他们发现,老年人的睡意分布时间与年轻人不同,他们较慢的脑电波的出现时间也与年轻人不一样。

该研究课题的作者阿卡狄·普提洛夫(Arcady Putilov)认为,有两套机制导致睡眠时间减少。人到中年,潜在的慢波睡眠减弱,让人很难保持睡着状态。而到老年,由于体温的变化和褪黑激素的减少,较强的生物钟节奏也会减弱。

密歇根大学研究人员安·阿伯(Ann Arbor)开发的一款名为Entrain的手机应用软件app的最新数据也支持这一观点,即老年人的生物钟节奏对睡眠的减少产生作用。该app能够帮助人们通过在白天的不同时刻调节灯的亮度来应对时差问题。

这款手机app的试用者需要输入他们通常的睡眠习惯,并选择是否与研究人员分享这部分数据。全世界有5000人进行了分享,它展示了全球不同年龄段人群的睡眠习惯一瞥。年轻人分为早起者和熬夜者,但是老年人的睡眠习惯较为一致。

大多数老年人早起早睡。该研究中,40多岁的男性的睡眠时间最短,这种情况很不寻常。但是研究发现,老年人睡眠时间比较固定,这表明过了退休年龄的人入睡和保持睡眠的时间范围较小。

所以,是身体生物钟的变化导致老年人难以入睡和睡眠时间较短。因此,或许老年人不需要太多睡眠这一说法只是一个迷。实际上,老年人只是睡眠的窗口期变短了而已。或许白天的瞌睡不会影响晚上的睡眠。相反,晚上缺觉会导致白天的困倦,所以人需要通过白天打瞌睡来补觉。

但是讨论并不到此为止。2008年在美国布莱根妇女医院(Brigham Women’s Hospital)进行的一项研究中,被测试者在数天中每天可以睡16个小时。60至72岁的被试者每天平均睡7.5小时,而18至32岁的被试者每天平均睡近9小时。一种解释是年轻人需要的睡眠比老年人更多,但是也有可能是年轻人平时睡觉太晚,他们睡眠时间长只是为了补觉。

该研究并没有排除老年人的生物钟让他们在白天无法入睡,即使他们需要睡眠。但是由一些同样研究人员进行的另一个研究,结果更为扑朔迷离。这次研究是在萨里大学(University of Surrey)进行的。

在该实验中,参与者被要求在每天的多个时间尝试小睡。研究再次发现,老年人较难入睡,这说明或者他们的生物钟让他们无法入睡,或者他们的缺觉程度比不上年轻人。研究人员这次确保让他们缺乏睡眠。

整个晚上,他们监测被试者的大脑活动,一旦发现慢波,他们就在房间制造噪音,打断被试者睡眠。第二天,筋疲力尽的老年人和年轻人一样容易入睡。这就说明当老年人真的需要睡眠时,他们也能睡着,而当他们睡不着时,可能是因为他们并不缺觉。

美国睡眠基金会(National Sleep Foundation)召集了一个专家委员会,在审阅了320项研究后,提出了64岁以下成年人每天睡七到九小时、65岁以上七到八小时的建议。

不过,人们仍然愿意相信,随着年龄的增长,生物钟背后的生理过程会发生变化。所以,目前仍不能确定老年人需要较少的睡眠是不是一个谜。不过已知的一点是,在漫长的、寂寞的、黑暗的清晨,你已经醒过来但感到没有得到充分的休息,这会让人难受,而且应当认真对待。

Cochrane(一个国际性的非赢利的民间医疗保健学术团体)组织调查了对60岁以上老人的睡眠问题进行认知行为干预疗法的案例研究,通过研究其中最佳的疗法,他们发现在某些情况下,干预有可能发挥作用,医生值得考虑将其作为安眠药的替代疗法。

原始出处:

 Putilov AA1. Age-associated Advance of Sleep Times Relative to the Circadian Phase of Alertness-Sleepiness Rhythm: Can it be Explained by Changes in Ratios Between Strengths of the Underlying Oscillatory Processes? Curr Aging Sci. 2016;9(1):44-56.

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    2016-09-17 ylzr123

    关注值得,学习。赞!好文探究。

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    2016-09-10 1e10c84am36(暂无匿称)

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    2016-06-05 沉心多思

    不错的文章,多学习

    0

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    2016-06-05 沉心多思

    不错的文章,多学习

    0

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    2016-06-04 忠诚向上

    好好学习

    0

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    2016-06-03 gyczyxy

    0

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    2016-06-03 乐奕11

    是的,确实

    0

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