....Last week, I was working with a well-known cardiologist on the subject of ‘Heart Disease caused by Lack of Sleep’. While I cannot share the video nor the slides because of confidentiality reasons, I have distilled the key points below in the hope it will save some of our lives.
Some Excerpts:
· Short sleep duration (<5 or 5-6 hours) increased risk for high BP by 350% to 500% compared to those who slept longer than 6 hours per night. Paper published in 2009.
As you know, high BP kills.
· Young people (25-49 years of age) are twice as likely to get high BP if they sleep less. Paper published in 2006.
· Individuals who slept less than 5 hours a night had a 3-fold increased risk of heart attacks. Paper published in 1999.
· Complete and partial lack of sleep increased the blood concentrations of High sensitivity C-Reactive Protein (hs-cRP), the strongest predictor of heart attacks. Even after getting adequate sleep later, the levels stayed high!!
· Just one night of sleep loss increases very toxic substances in body such as Interleukin-6 (IL-6), Tumour Necrosis Factor-Alpha (TNF-alpha) and C-reactive protein (cRP). They increase risks of many medical conditions, including cancer, arthritis and heart disease. Paper published in 2004.
· Sleeping for <=5 hours per night leads to 39% increase in heart disease. Sleeping for <=6 hours per night leads to 18% increase in heart disease. Paper published in 2006.
Ideal Sleep
For lack of space, I cannot explain here the ideal sleep architecture. But in brief, sleep is composed of two stages: REM (Rapid Eye Movement) and non-REM. The former helps in mental consolidation while the latter helps in physical repair and rebuilding. During the night, you alternate between REM and non-REM stages 4-5 times.
The earlier part of sleep is mostly non-REM. During that period, your pituitary gland releases growth hormones that repair your body. The latter part of sleep is more and more REM type.
For you to be mentally alert during the day, the latter part of sleep is more important. No wonder when you wake up with an alarm clock after 5-6 hours of sleep, you are mentally irritable throughout the day (lack of REM sleep). And if you have slept for less than 5 hours, your body is in a complete physical mess (lack of non-REM sleep), you are tired throughout the day, moving like a zombie and your immunity is way down (I’ve been there, done that)
Finally, as long-distance runners, you need an hour of extra sleep to repair the running related damage.
If you want to know if you are getting adequate sleep, take Epworth Sleepiness Test below.
|
Moderator's Comments:
|
|
Original Attached Image Not Available
|
|
Interpretation: Score of 0-9 is considered normal while 10 and above abnormal. Many a times, I have clocked 21 out the maximum possible 24, the only saving grace being the last situation, since I don’t like to drive (maybe, I should ask my driver to answer that line
In conclusion:
Barring stress control, one did everything right: eating proper food, exercising (marathoning!), maintaining proper weight. But he missed getting proper and adequate sleep, minimum 7 hours. In my opinion, that killed him.
If you are not getting enough sleep (7 hours), you are playing with fire, even if you have low stress.
I always took pride in my ability to work 50 hours at a stretch whenever the situation warranted. But I was so spooked after seeing the scientific evidence last week that since Saturday night, I ensure I do not even set the alarm clock under 7 hours. Now, that is a nice excuse to get some more sleep.
Many of us are doing exactly the same, perhaps out of ignorance. Please forward this mail to as many of your colleagues as possible, especially those who might be short-changing their sleep. If we can save even one young life because of this email, I would be the happiest person on earth.
ps: Incidentally, just as human beings need 7 hours of sleep, you should know that cats need 15 hours of sleep and horses need 3 hours of it. So are you planning to be a cool cat or a dumb horse?
