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Levels of circulating caffeine peak approximately thirty minutes after oral administration. What is problematic, though, is the persistence of caffeine in your system. In pharmacology, we use the term “half-life” when discussing a drug’s efficacy. This simply refers to the length of time it takes for the body to remove 50 percent of a drug’s concentration. Caffeine has an average half-life of five to seven hours. Let’s say that you have a cup of coffee after your evening dinner, around 7:30 p.m. This means that by 1:30 a.m., 50 percent of that caffeine may still be active and circulating throughout your brain tissue. In other words, by 1:30 a.m., you’re only halfway to completing the job of cleansing your brain of the caffeine you drank after dinner.
Why We Sleep
Matthew Walker
Goals are the ticket out of any sense of depression. They improve and offset the losses or decay in our lives so we don’t end up in a rut. They alleviate that feeling that you have worked hard and accomplished nothing. When you are working toward Gain, you end the day feeling like you have made progress and are moving forward. And the momentum you’ve created makes you feel balanced and energized— like today is better than yesterday, like you are better than you were yesterday. It gives hope for the future. It lets us sleep at night knowing that because we are working hard, things are getting better all the time. That sounds like balance. That sounds like satisfaction and happiness to me.
Two Forms of Human Motivation: Gain and Prevent Pain
farnamstreetblog.com
Struggling to hold on to information and then recall it had helped the group distracted by math problems transfer the information from short-term to long-term memory. The group with more and immediate rehearsal opportunity recalled nearly nothing on the pop quiz. Repetition, it turned out, was less important than struggle.
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