A good night's sleep is important and if you want to get the most out of your bedtime ritual then it's key that you go to bed and get up at the right time.
优质的睡眠非常重要，如果你想获得充分的休息，那么正确的入睡和起床时间是关键。
7点起床，几点入睡合适？
国际睡眠医学会将睡眠周期分为5个阶段：入睡期、浅睡期、熟睡期、深睡期、快速眼动睡眠期(REM)。人的一个完整睡眠周期大约90至110分钟，一晚上通常要经历四五个睡眠周期。如果在两个睡眠周期中间或是快速眼动期醒来，人就会觉得昏昏沉沉。
The clever sleep calculator works out what time you need to go to bed just by the time you need to get up combined with information on the body's natural sleep pattern - which works in 90 minute cycles.
人体的自然睡眠周期为90分钟，这款聪明的睡眠计算器根据人体睡眠周期和你需要起床的时间，计算出你需要在什么时候睡觉。
Being woken by an alarm during one of the 90-minute cycles is often what makes people feel groggy1 in the morning – making it seem harder to get up out of bed.
在90分钟的睡眠周期内被闹钟吵醒通常会让人们早上感到头昏眼花——这让起床变得更加困难。
The sleep calculator, made by the team at home interiors specialist Hillarys, can work out the time you need to go to bed to make sure you wake up with a spring in your step.
由室内家装公司Hillarys研发的睡眠计算器可
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