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.
It turns out thatâs not true,â says Michael Breus, PhD, a sleep specialist and author of The Sleep Doctorâs Diet Plan: Lose Weight Through Better Sleep. Just 30 minutes of sleep loss could make you more likely to gain.