The lack of sleep slows metabolism and increases the feeling of hunger. According to the results of a study published in the American Journal of Clinical Nutrition,lack of sleep increases the feeling of hunger and decreases calorie consumption.
To determine the effects of poor sleep on metabolism and appetite, the researchers made an experiment with 14 participants(14 students)guarding the different conditions of sleep for several days - interrupted sleep, normal sleep and night without sleep. Then they observed and measured the changes in food consumption, blood glucose levels and levels of different hormones that affect metabolism.
It was concluded that only one sleepless night compared with the morning after a good night's sleep leads to a slowing metabolism the following morning. It was observed that significantly is reduced the energy consumption while breathing and digestion(5-20 %).
After a sleepless night, the participants had higher blood sugar levels, higher levels of stress hormones and hormone ghrelin, which regulates appetite. They had a bigger appetite and they wanted to eat food with more calories.