Discrete Mathematics/Functions and relations. This article examines the concepts of the function and the relation. A relation is any association or link between elements of one set, called the domain or (less formally) the set of inputs, and another set, called the range or set of outputs.
Sleep deprivation. Sleep deprivation is the condition of not having enough sleep; it can be either chronic or acute. A chronic sleep-restricted state can cause fatigue, daytime sleepiness, clumsiness and weight loss or weight gain. It adversely affects the brain and cognitive function.
In the last few years, the link between what we eat and our sleep patterns has emerged as an important piece in the obesity puzzle. Not only can the right food aid sleep, it works the other way too â better sleep promotes weight loss. Lack of sleep, however, has been found to stimulate production of hunger hormone ghrelin, which makes us overeat. Evidence shows that the more sleep you get, the fewer calories you eat the next day.