Sleep Dept

 There are two kinds of sleep debt; partial sleep deprivation and total sleep deprivation. Partial sleep deprivation occurs when a person or alab animal sleeps too little for many days or weeks. Total sleep deprivation means being kept awake for days or weeks.There is debate in the scientific community over the specifics of sleep debt, and it is not considered to be a disorder.
In one study Different groups of people were tested with different sleep times for two weeks: 8 hours, 6 hours, 4 hours, and totalsleep deprivation. Each day they were tested for the number of lapses on the PVT. The results showed that as time went by, each group's performance worsened, with no sign of any stopping point. Moderate sleep deprivation was found to be detrimental; people who slept 6 hours a night for 10 days had similar results to those who were completely sleep deprived for 1 day. Let's do some sleep math. You lost two hours of sleep every night last week because of a big project due on Friday. On Saturday and Sunday, you slept in, getting four extra hours. Come Monday morning, you were feeling so bright-eyed, you only had one cup of coffee, instead of your usual two. But don't be duped by your apparent vim and vigor: You're still carrying around a heavy load of sleepiness, or what experts call "sleep debt"—in this case something like six hours, almost a full nights' sleep.

Sleep debt is the difference between the amount of sleep you should be getting and the amount you actually get. It's a deficit that grows every time we skim some extra minutes off our nightly slumber. "People accumulate sleep debt surreptitiously," says psychiatrist William C. Dement, founder of the Stanford University Sleep Clinic. Studies show that such short-term sleep deprivation leads to a foggy brain, worsened vision, impaired driving, and trouble remembering. Long-term effects include obesity, insulin resistance, and heart disease. And most Americans suffer from chronic deprivation.

Although snoring may be harmless for most people, it can be a symptom of a life threatening sleep disorder called sleep apnea, especially if it is accompanied by severe daytime sleepiness. Sleep apnea is characterized by pauses in breathing that prevent air from flowing into or out of a sleeping person’s airways. People with sleep apnea awaken frequently during the night gasping for breath. The breathing pauses reduce blood oxygen levels, can strain the heart and cardiovascular system, and increase the risk of cardiovascular disease. Snoring on a frequent or regular basis has been directly associated with hypertension. Obesity and a large neck can contribute to sleep apnea. Sleep apnea can be treated; men and women who snore loudly, especially if pauses in the snoring are noted, should consult a physician

The unsung hero of male self-improvement is sleep.  A lack of sleep, or “sleep debt,” will retard your progress in weightlifting, womanizing, and just about any other worthwhile pursuit you could care to name.   People who stay up late and sleep late, even if they get adequate sleep, exhibit a marked increase in psychopathology, i.e. mental disorders.  Early birds, or morning types, also tend to have healthier lifestyles.The researchers of Satoshi Kanazawa examined ethnographies of hunter-gatherer groups, and found that nocturnal activities were relatively rare in these societies.  Since smart people are more likely to behave evolutionary novel ways, he theorized that higher IQ individuals were more likely to be night owls.  A longitudinal study of American adolescents proved him right.A cross-cultural study of 2.4 million (!) users of social media showed that people post the most positive messages on twitter around two hours after waking.  Since a positive mood is important for “physical and emotional well-being, working memory, creativity, decision-making, and immune response” it’s probably best to schedule difficult tasks around this time.