原来黄粱一梦这种还是有科学道理的。在梦里就是觉得时间长。“During those five minutes of actual time, you may have felt like you were dreaming for an hour, perhaps more. Unlike the phase of sleep where you are not dreaming, wherein you lose all awareness of time, in dreams, you continue to have a sense of time. It’s simply not particularly accurate—more often than not dream time is stretched out and prolonged relative to real time. Although the reasons for such time dilation are not fully understood, recent experimental recordings of brain cells in rats give tantalizing clues.”

原来夜猫子是基因决定的。社会对夜猫子很不公平…… “Sadly, society treats night owls rather unfairly on two counts. First is the label of being lazy, based on a night owl’s wont to wake up later in the day, due to the fact that they did not fall asleep until the early-morning hours. Others (usually morning larks) will chastise night owls on the erroneous assumption that such preferences are a choice, and if they were not so slovenly, they could easily wake up early. However, night owls are not owls by choice. They are bound to a delayed schedule by unavoidable DNA hardwiring. It is not their conscious fault, but rather their genetic fate.” from "Why We Sleep: Unlocking the Power of Sleep and Dreams" by Matthew Walker