也许你有过这样的经历:闹钟响了半天,在迷迷糊糊中被自己按掉,一个翻身又睡了过去;反而前一晚窗帘忘记拉上,第二天被阳光照醒得更早,却没有被闹铃声催起的痛苦。要在清晨能够自然、心情愉悦地醒来,光照比声音更重要。刚过夏至,北半球天亮得早黑得晚,正是用光照改善睡眠的好时机。 Perhaps you have had such an experience: the alarm rang for a long time, was drowned out by himself, one turned over and slept in the past; but the night before the curtains forget to pull up the next day was awakened by the sun earlier, But was not the alarm caused by alarm pain. To be able to wake up naturally in the morning, the light is more important than the sound. Just after the summer solstice, the darkness of the northern hemisphere gets darker and darker morning, which is a good time to improve sleep with light.