Sleeping longer should make you feel great, right? So why does it sometimes make you feel tired?
The average person spends about one-third of his life sleeping. As much as people love sleep, maybe you don’t want to spend any more than one-third of your life in it so as not to miss all the excitement. Plus, oversleeping a lot can lead to severe health problems.
The Sleep Doctor, as Michael J. Breus, is known, answers the question of why you feel tired after a long sleep in an article on Huffington Post  and on his own Twitter account.
Dr. Breus, an author and physician, says the right amount of sleep is so important to people’s health that sleep itself should be added to the vital signs along with heart rate, temperature and blood pressure.
His Twitter account  has links to articles by himself and others advising that sleep loss and other sleep aberrations can cause heart disease, high blood pressure, cancer, diabetes, contribute to you eating unhealthy foods and gaining weight, and undercut social skills.
Plus, he reports, getting the right amount of sleep can make you look more intelligent.
The World Sleep Society says there are more than 100 sleep disorders, and sleep is one of the three pillars of good health, along with a good diet and exercise.
In his Huff Post article on feeling tired after sleeping longer, Dr. Breus says the reason for this is because the circadian rhythm gets thrown off. The circadian rhythm, also known as the biological clock, is the cycle of sleeping and waking.
The circadian rhythm can be interrupted by being a person exposed to light when it is normally dark, a break in a person’s routine, sleeping too much or too little or because of chemical stimulation or tranquilization (drugs).
Sleep hygiene video
Dr. Breus says the body’s rhythms reset every 24 hours. He adds: “Once our body clocks, or circadian pacemakers, start ‘telling the wrong time,’ we feel it in lethargy, fatigue, and a sleep cycle gone haywire. The clock says one thing and your body says another, very similar to jet lag.”
Within the body’s biological rhythm is a sleep cycle, which lasts between 80 to 120 minutes. The average is 90 minutes, Dr. Breus says. He writes:
The average person who sleeps 7.5 hours goes through five cycles each night. When you sleep in, you are extending your number of cycles, and then generally you wake up in the middle of a cycle. If it is in the part of the cycle that is deep or REM sleep you can wake and feel worse than before you went to sleep.
Dr. Breus gives tips on how to keep your biological rhythm working like clockwork:
The World Sleep Society website , which proclaims Good Sleep Is a Reachable Dream, has 10 commandments of sleep that it publicizes on World Sleep Day. The site advises:
Harvard Health has an article  that states any sleep pattern disruption can make you feel tired:
Research bears out the connection between too much sleep and too little energy. It appears that any significant deviation from normal sleep patterns can upset the body's rhythms and increase daytime fatigue. The best solution is to figure out how many hours of sleep are right for you and then stick with it — even on weekends, vacations, and holidays.
WebMd.com has an article  that says oversleeping can lead to heart disease, diabetes, and increased risk of dying. Too much sleep can cause headaches, obesity and back pain, the article says.
The article states:
The amount of sleep you need varies significantly over the course of your lifetime. It depends on your age and activity level as well as your general health and lifestyle habits. For instance, during periods of stress or illness, you may feel an increased need for sleep. But although sleep needs differ over time and from person to person, experts typically recommend that adults should sleep between seven and nine hours each night.
Got that? Seven to nine hours of sleep per night is optimal. Sweet dreams!
Stories of coming back from a downfall after great success are inspiring for anyone—even for young people who haven’t made their mark on the world yet. History and mythology are filled with people who were at the height of success, crashed and came back again.
Sometimes, people need to lose everything material to realize that they didn’t need it, or that the health and safety of their families are worth more than all the success and gold in the world. Sometimes people come back even stronger and more successful than before they “fell.”
Unless you work outdoors or indoors in a job where you are physically active all day, it can be difficult for some people who have desk jobs to stay awake at work without caffeine.
Maybe the most important thing you can do to make sure you don’t nod off at work is to get a good night of sleep, at least 7 to 8 hours, at a regular time every night. Boredom can also cause you to nod off. Other than getting a good night’s sleep and having a fascinating job, there are things you can do to stay awake.
How do investment bankers stay awake on their 18-hour shifts?
Investment bankers work such long hours that many resort to chemical stimuli. There have been rumors of methamphetamine and cocaine use among investment bankers to burn the midnight oil. Other investment bankers take Ritalin or Adderall, which are given to children with ADHD but which are stimulants for adults. But the mainstay is probably coffee, energy drinks, and other concoctions containing caffeine.