Sleep deprivation has been demonstrated in studies to result in decreased energy consumption at night and increased energy intake demand during the day, therefore a lack of sleep may lead to overeating and an increase in body weight. Those who sleep in a chilly room expend more calories because their bodies require the energy to maintain a healthy body temperature. This means that sleeping in a cold room will help you lose weight by making you use up all your excess energy. Some studies have shown that obese people tend to sleep less well than those who are not obese. It is possible that poor quality sleep contributes to increasing levels of obesity. However, other research has shown that obese people report similar amounts of sleep time as those who are not obese. It has also been suggested that poor quality sleep may cause you to eat more during the day due to daytime drowsiness resulting in increased hunger levels. However, there is little evidence for this theory since no direct experiments have been done to prove it. What we do know is that sleep loss affects many parts of our biology and behavior, some of which may lead us to want to eat more to make up for it. The important thing is that losing sleep doesn't solve any problem, it only makes others worse.