Author: Dr. Travis Bradberry Source: HuffPo
The next time you tell yourself that you’ll sleep when you’re dead, realize that you’re making a decision that can make that day come much sooner. Pushing late into the night is a health and productivity killer.
The short-term productivity gains from skipping sleep to work are quickly washed away by the detrimental effects of sleep deprivation on your mood, ability to focus, emotional intelligence, and access to higher-level brain functions for days to come. The negative effects of sleep deprivation are so great that people who are drunk outperform those lacking sleep.
Why You Need Adequate Sleep to Perform
We’ve always known that sleep is good for your brain, but new research from the University of Rochester provides the first direct evidence for why your brain cells need you to sleep (and sleep the right way—more on that later). The study found that when you sleep your brain removes toxic proteins from its neurons that are by-products of neural activity when you’re awake. Unfortunately, your brain can remove them adequately only while you’re asleep. So when you don’t get enough sleep, the toxic proteins remain in your brain cells, wreaking havoc by impairing your ability to think—something no amount of caffeine can fix.
Skipping sleep impairs your brain function across the board. It slows your ability to process information and problem solve, kills your creativity, and catapults your stress levels and emotional reactivity.
What Sleep Deprivation Does to Your Health
Sleep deprivation is linked to a variety of serious health problems, including heart attack, stroke, type 2 diabetes, and obesity. It stresses you out because your body overproduces the stress hormone cortisol when it’s sleep deprived. While excess cortisol has a host of negative health effects that come from the havoc it wreaks on your immune system, it also makes you look older, because cortisol breaks down skin collagen, the protein that keeps skin smooth and elastic. In men specifically, not sleeping enough reduces testosterone levels and lowers sperm count.
People who get enough sleep live longer, healthier lives, but I understand that sometimes this isn’t motivation enough. So consider this—not sleeping enough makes you fat. Sleep deprivation compromises your body’s ability to metabolize carbohydrates and control food intake. When you sleep less you eat more and have more difficulty burning the calories you consume. Sleep deprivation makes you hungrier by increasing the appetite-stimulating hormone ghrelin and makes it harder for you to get full by reducing levels of the satiety-inducing hormone leptin. People who sleep less than 6 hours a night are 30% more likely to become obese than those who sleep 7 to 9 hours a night.
How Much Sleep Is Enough?
Most people need 7 to 9 hours of sleep a night to feel sufficiently rested. Few people are at their best with less than 7 hours, and few require more than 9 without an underlying health condition. And that’s a major problem, since more than half of Americans get less than the necessary 7 hours of sleep each night, according to the National Sleep Foundation.