睡眠的意义
人的一生有１／３的时间是在睡眠中度过的，在睡眠过程中，全身包括中枢神经系统都得到恢复和休息。神经元和相关组织恢复重建和再生需要机体的休息，而只有睡眠状态能提供这种休息。睡眠具有很多功能，包括恢复注意力、促进生长以及巩固记忆和缓解紧张情绪等。睡眠是机体复原、整合和巩固记忆的重要环节，睡眠是健康不可缺少的重要组成部分，是健康生命所必需。
睡眠的周期
一个睡眠周期一般持续９０～１１０分钟，要依次经过下面这些不同阶段：第一阶段是浅慢波睡眠，只持续几分钟，是从清醒向深睡过渡的阶段；第二阶段的睡眠占睡眠时间的４５％左右，眼睛活动停止，大脑活动变慢，体温降低，呼吸规律；第三和第四阶段（Ⅲ期和Ⅵ期）统称为深睡眠，这部分睡眠是恢复精力的主要部分；最后是快动眼睡眠。在整个夜晚，一般会经过４～５个睡眠周期，每个周期依次相连。
什么是失眠
睡眠良好是身心健康的主要标志。失眠是最常见的睡眠障碍，是指各种原因引起的睡眠不足、入睡困难、早醒。失眠症的主要症状是对白天活动表现的影响，例如感觉疲劳、烦躁、情绪失调、注意力不集中和记忆力差等，所以失眠者的能力和效率往往降低。
失眠症的一般定义：睡眠不足或睡眠质量不好的表现，与下列一种或多种症状有关：
入睡困难；
夜间多次觉醒，不能再入睡；
清晨早醒；
睡醒后不能恢复精力；
失眠症是一种未被广泛认知的疾病……。
失眠的危害：
1. 失眠导致身体免疫力下降，对各种疾病的抵抗力减弱。
2. 失眠引起记忆力减退、头痛。
3. 失眠影响工作、学习和生活。
4. 失眠可导致植物神经紊乱。
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5. 经常失眠可引起老年痴呆症。
6. 经常失眠使人过早衰老，缩短寿命。
7. 儿童睡眠不足会影响身体的生长发育。
