用白天信号灯以识别。
如果你早上运动的话，你的大脑会在大白天就接到睡眠信号，从而大大减缓你的节奏。
If you work out in the morning, your brain gets that sleep signal midday and throws off your rhythm.
这个无意识认知过程看上去需要和白天清醒时候处理进来的信号所需的同样的大脑资源。
This unconscious cognition appears to demand the same brain resources used for processing incoming signals when awake.
“睡前光线过强也会影响睡眠，”阿内德特说，这是因为弱光会给我们的生物钟发出信号“该休息了”，而强光发出的信号则是“白天到了！”
"Bright light too close to bedtime can make it hard to fall asleep," Arnedt says. That's because dimness signals the biological clock that it's time to wind down, while bright light says "daytime!"
手机信号时续时断，白天停水晚上停电。
When the phone signal when water cut, daytime renewal at blackout.
水手们白天用旗夜晚用灯发信号。
水手们白天用旗夜晚用灯发信号。
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