| http-equiv="Content-Type" content="text/html; | | | | their stomachs. In addition, the lack of sleep reduces |
| charset=utf-8"> | | | | self-control ability. |
| Signal one: It is difficult to make decision. In order to | | | | Signal three: Have cold constantly. People who lack of |
| plan a vacation, you stay up to determine the specific | | | | sleep are more susceptible to disease. In a study, the |
| dates and the specific locations, but in the next day, | | | | healthy respondents are injected flu virus by |
| you still hesitate in some details such as the seat on | | | | researchers. The results showed that people who |
| airplane is on the left or right, call a taxi right now or | | | | have less than seven hours sleep time are more likely |
| wait for a moment. Expert studying on sleep from | | | | to be infected with influenza virus. As for people who |
| University of California said that when people felt | | | | have only four hours of sleep every night for several |
| exhaustion on both physical and mental, they | | | | consecutive days, their immune response to influenza |
| can’t identify important information and irrelevant | | | | vaccine inoculation is weaker. |
| information. As a result, the simplest decision is | | | | Signal four: Always want to cry. Yes, lack of sleep |
| magnified. Moreover, fatigue people are more easily | | | | causes emotional volatility. One study found that |
| took a gamble and finally made the wrong decision. | | | | people more easily depressed if they lack of sleep, |
| Signal two: Always feel hunger even had eaten a lot. | | | | because the exhausted brain will put aside more |
| Studies have shown that lack of sleep for a long time | | | | negative memory. Sleep deprived people's behavior is |
| would disrupt blood sugar levels, causing the body | | | | very similar with depression patients. |
| produce less leptin and more ghrelin. The former is a | | | | Signal five: the ability to reflect is slow in thought or |
| hormone which suppresses appetite while the latter is | | | | action. Researchers on Human Sleep Research |
| a hormone that stimulates appetite. These physiological | | | | Center from Stanford University said that the vast |
| changes will inevitably lead to overeating. The | | | | amount of evidences showed sleep deprived people's |
| spokesman of American Academy of Sleep Medicine | | | | ability to reflect is slow. In addition, Sleepiness can lead |
| said fatigue people are particularly love sweet foods | | | | to impairment of balance and depth perception. |
| and other simple carbohydrates, which can quickly fill | | | | |