Numerous studies have found that mo

Numerous studies have found that morning people are more self-directed and agreeable. And compared to night owls, they plan for the future more and have a better sense of well-being.Although morning types may achieve more academically, night owls tend to perform better on measures of memory, processing speed and cognitive（认知）ability, even when they have to perform those tasks in the morning. Night-time people are also more open and more creative. And one study shows that night owls are as healthy and wise as morning types and a little bit wealthier.Still think the morning people sound more like CEO material? Don't set your alarm for 5 am just yet. As it turns out, overhauling （全面改革）your sleep time may not have much effect.“If people are left to their naturally preferred time, they feel much better. They say that they are much more productive. The mental capacity they have is much broader,” says Oxford University biologist Katharina Wulff. On the other hand, she says, pushing people too far out of their natural preference can be harmful. When they wake early, for example, night owls are still producing melatonin（褪黑素）. “Then you disrupt it and push the body to be in the daytime mode. That can have lots of negative physiological consequence,” Wulff says, like a different sensitivity to insulin and glucose （葡萄糖）— which can cause weight gain.