用生物警报时钟自然地醒
人的睡眠是包括醒来阶段、非REM睡眠和REM的周期(迅速眼睛运动)睡眠。 在醒来阶段，您的身体将准备您睡觉。 您的身体将开始减速，您的肌肉起动放松，并且您的眼睛运动将减速。 在醒来阶段以后，您将走向非REM包括4个阶段并且从90 - 120分钟持续的睡眠。 在阶段1，睡眠称睡意。 一旦您是在这个阶段，眼睛是闭合的。 但，如果您从它被激起，您也许感到，好象您未睡觉。 阶段2是轻的睡眠期间。 在这个阶段， polysomnographic读书将显示断断续续的峰顶和谷或者正面和阴性波浪。 这些波浪表明与肌肉放松的期间混合的肌肉紧张的自发期间。
这种类肌肉紧张在睡眠其他阶段能看作为反应对听觉刺激。 心率减慢，并且体温减少。 这时，身体准备进入演出3 &阶段4，熟睡阶段。 阶段3和阶段4是熟睡阶段。 然而，阶段4比阶段3强烈。 这些阶段知道，慢挥动，或者三角洲，睡眠。 特别是在阶段4期间，在期间慢挥动睡眠，肌电图纪录减慢高高度波浪，表明熟睡和节奏性连续性的样式。 在阶段4以后，您将走向REM睡眠。 波动图式在REM于阶段1睡眠是相当相似的。 在这个阶段，您将体验强烈作梦。
在您以后睡着， 5个阶段非REM，并且REM阶段将重覆周期地在夜期间。 一级循环通常持续90 - 110分钟和每个随后周期长期将持续。 知道人睡眠阶段导致了称被设计查出人的睡眠阶段和醒来睡眠者在完善的时间的生物警报时钟的发明。 这些生物警报时钟通过一些敏感电极将查出脑波或身体运动被安置在枕头盒之下。 电极将追踪睡眠什么阶段您是在轻的睡眠阶段期间，和醒来您。 因为睡眠周期从90 -110分钟通常持续，生物警报时钟只将有近似地30分钟误差幅度。
There are a few types of bio-alarm clocks available such as Sleeptracker, SleepSmart and aXbo Sleep Phase Alarm Clock. Sleeptracker can be worn on your wrist like a watch. It will monitor signals from your body that indicate whether you are asleep or awake. SleepSmart is a headband with circuits that detect brainwaves during sleep, and the aXbo Sleep Phase Alarm Clock is a wristband that reads body movements.
Bio-alarm clocks are becoming very popular nowadays. Businessmen, travelers, students, etc. find it very useful and helpful. Having said that, there are also scientists who disagree with the use of these scientific products. Dr. Gregory Belenky, a sleep expert at Washington State University Spokane, has commented that light stage sleep isn’t the best time to be woken by an alarm. Dr. Gregory is of the opinion that light sleep stage is the hardest time to wake a person up unnaturally and he also has doubts on the functionality of this device. Waking up has become more sophisticated and complicated than when our mums used to holler from downstairs or when our sister/brother used to come and jump on our beds.
SleepTracker watch on Dr. Phil TV Show
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