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.
Since obstructive sleep apnea often results from being overweight or obese, people who wish to relieve their sleep apnea symptoms can lose weight. Weight loss does not always cure sleep apnea since there can be other issues that cause the condition, including deviated septum or other facial abnormalities.he type of sleep apnea that is common to obese people is called obstructive sleep apnea, where the flow of air through the airways is blocked, preventing normal breathing. Symptoms of obstructive sleep apnea are: 1  loud snoring. 2  one or more pauses in breathing during the night.