Ever think you're getting enough sleep only to wake up tired? It's not just you-it happens to the best of us. Now, scientists say they have discovered the secret to waking up clear-headed and refreshed each and every morning.
According to a new study from the University of California, Berkeley, published in Nature Communications, beyond sleep quality, the second main feature predicting day-to-day changes in morning alertness (机敏) was the intensity of physical activity the day before. In particular, researchers found that when the extent of an individual's physical activity was comparatively greater the day before, people felt more alert the next morning.
Another factor happens not on the day before or even the night before, but the that participants consumed for breakfast that explained their alertness levels. When individuals consumed the "high carbs"(高碳水)breakfast，they experienced higher levels of alertness.
Beyond the effects of the high carbohydrate meal itself, one of the strongest outcomes shown in the study was the marked reduction in alertness on days when participants consumed a lot of sugar. It may sound paradoxical that a lot of sugar predicts a drop in alertness and the high carb breakfast is linked to an increase in alertness. But, despite their common high carbohydrate content, there are key nutritional (营养的) differences between the high-carb and sugar meals.
Raphael Vallat, first author of the study, said, "If you have better sleep quality, you're going to see an increase in your alertness. If you run two kilometers on the day before, you're going to see an increase. You can see improvements with each and every one of these factors."
