Why Sleep is above all else.....
One of the biggest obstacles I face when coaching people to optimal health is getting them to understand the importance of going to bed on time. Today's world of late night TV and bright lights at touch of a switch make it easy to forget that for thousands of years we lived in sync with the light and dark cycles of day and night. Our physiology is still the same as our ancient sun-driven ancestors, we are simply packaged in fancy clothes, drive cars and use lots of electronic gadgets. Despite the availability of artificial, 24-hour, 365-days-a-year light from mobile phones, TV's and computers etc. We are still tuned to the natural rhythm of daily and seasonal light/dark cycles. We rely on sunlight for a variety of reasons, one being Vitamin D (which I covered in previous blogs)
Whenever light stimulates your skin or eyes, regardless of the source, your brain and hormonal system think it is morning. In response to light, your hormonal system naturally releases cortisol. Cortisol is an activating hormone that is released in response to stress, light being a form of electromagnetic stress. This activates the body and prepares it for movement, work, fight or flight, or whatever may be necessary for survival. We must remember that our physiological systems were well developed long before we even began using fire, so as far as your body is concerned:
Light Sunshine = Cortisol release = Daytime activities.
This first figure shows your natural sleep/wake cycle. Many of our hormones are produced in tune with the cycle of the sun. Stress/activating hormones (black line) are produced as the sun rises and peak around mid-morning. As the day progresses, the levels of stress hormones decrease. The body then begins to increase production of growth and repair hormones (white line) as the sun goes down. Our bodies are designed to wind down from sunset until about 10 p.m. when sleep and physical repair should begin. Psychogenic repair takes place predominantly from about 2 to 6 a.m.
As the sun rises, our cortisol levels also rise and peak around 6 - 9 a.m. (Figure 1). They then drop a little but remain high through midday, supporting daily activities. In the afternoon, cortisol levels begin dropping significantly, especially as the sun goes down. Decreasing cortisol levels allow the release of melatonin (the sleep hormone) and increase levels of growth and repair hormones. If we follow our natural sleep cycles, we start winding down as the sun sets and should fall asleep by about 10 p.m. Physical repairs mostly take place when the body is asleep, between about 10 p.m. and 2 a.m. After 2 a.m. the immune/repair energies are more focused on psyche (mental) repair, which lasts until we awaken
What happens when you have disrupted Sleep/Wake Cycles Figure 2 shows what happens if cortisol levels elevated above normal by internal or external stressors. The continual release of stress hormones may be a great idea for a mountain climber who is climbing hard to avoid a storm and is with a climb or freeze situation, but you don't want this response to be an everyday occurrence. Further, a brightly lit house, late night TV and working into the evening will keep the levels of stress hormones high past sundown. Fluorescent lighting and computer screens flicker on and off between 60 and 120 cycles per second, which your brain interprets as morning sunlight. Since cortisol can take hours to clear from your blood stream, this will prevent the normal release of melatonin and growth/immune hormones, cutting into your immune system's valuable repair time. If you go to bed after midnight you've already missed over two hours of your physical repair cycle, which, as I said above, should start around 10 p.m. People working the graveyard shift or parents getting up in the middle of the night regularly have their psychogenic repair cycle disrupted. Such people commonly have a laundry list of nagging musculoskeletal injuries, an increased incidence of headaches, a sagging personality and even neurogical disorders. A disrupted sleep/wake cycle can also result in adrenal fatigue. The adrenal glands are located atop the kidneys and produce hormones called glucocorticoids, of which cortisol is one. Chronic exposure to stress and light at night requires the adrenals to produce more cortisol than is normal. Excessive production of cortisol leads to adrenal fatigue, which presents itself in any number of ways, including chronic fatigue syndrome, viral infections, bacterial and fungal infections and headaches. In order to overcome adrenal fatigue, it's very important to respect your natural circadian rhythm and allow your adrenals to rest.
Factors That Can Disrupt Your Sleep/Wake Cycles 1. Stimulants What do you do for a pick-me-up when you ae tired? Most people reach for something sweet, drink a beverage containing caffeine or smoke a cigarette. Some will have coffee with sugar added, even perhaps while they smoke! Caffeine, sugar and tobacco are all stimulants, which excite your sympathetic nervous system (your fight or flight response). This triggers the release of (you guessed it!) cortisol! Remember, cortisol tells your brain that it's time to get up in the morning or that it's time for action! I have posted blogs on coffee before and is why I recommend my clients to drink a coffee containing ganoderma lucidum, this coffee is organic and when mixed with the ganoderma it creates an alkaline effect in the body, meaning it balances out the Ph levels, supporting the immune system and providing a natural detoxification. An eight ounce cup of strong coffee contains about 300 mg of caffeine. Caffeine has a half-life of about six hours. So, if you have coffee at 3 p.m., you'll still have 150 milligrams (mg) of caffeine in your blood stream at 9 p.m. Six hours later, well into the psychogenic repair cycle of immune function, you'll have 75 mg of caffeine stimulating your adrenal glands to produce cortisol. Ideally, you should not drink anything containing caffeine after lunch and throughout the evening. Now the ganoderma still has caffiene in it, it just does not cause half the amount of raise in cortisol than regular coffee does. One teaspoon of sugar has been shown to suppress your immune system for as long as four hours. When you consider that the average can of soda contains ten teaspoons of sugar, or that the average breakfast cereal is comprised of between 46% and 53%sugar, you can see how easily sugar finds its way into your diet. As a health practitioner I also try to match clients to their ideal metabolic type. A diet that does not match your metabolic type typically results in large fluctuations of blood sugar levels. Blood sugar levels elevate after eating, triggering the release of insulin to break down and store the blood sugar. This often results in an overcompensation response, which in turn leads to a blood sugar low. Unfortunately, your brain considers low blood sugar to be a dire emergency, a major stressor. Stress hormones are released to counterbalance the condition by triggering the liver to release stored glycogen, which elevates blood sugar. Meanwhile, most people feel the effects of low blood sugar, and, before their liver can do its job, they have another sweet snack or caffeine to keep them going. This cycle keeps cortisol levels high, preventing the body from winding down in the evening and getting a good night's sleep. 2. Electromagnetic pollution Unless you regularly sleep in a cave miles away from human civilization, you are probably exposed to low frequency electromagnetic energies. Power lines, electrical circuits in your walls, ceilings and floors and electrical appliances such as electric blankets and TVs all emit such energies. This electromagnetic pollution can disrupt natural sleep/wake cycles. I know in this day and age it is very hard to get away from the EMF waves. I have touched upon this in recent blog on sunlight and its benefits to the body. One of the ways you can counteract the effects of EMF on the body are to be outside in the sun, perhaps at the end of the day, and just be barefoot on the ground. Your body will not only take in the negative ions from the ground but will also release some of the positive ions it has soaked up from the EMF waves. 3. Entrainment Physiologists and medical doctors have found that you can be entrained, or synchronized to a dysfunctional schedule in as little as 7-21 days. This means that if you stay up until midnight for 1-3 weeks in a row, your internal body clock will become trained to wait until midnight to start reducing cortisol output and increasing melatonin production. Just because you didn't start the physical repair on time doesn't mean it's going to get jammed in. Your natural rhythms will automatically begin the psychogenic repair around 2 a.m., thus robbing your body of two good hours of physical repair. If your body gets used to going to bed late and you then decide to get to bed earlier one night, you'll probably find you have a hard time falling asleep at 10:30 p.m. Now you're faced with the task of entraining your system to release your sleepy-time chemicals early enough so that you can get to sleep on time for a full cycle of physical repair. For some this is difficult. We live in a world where it's easy to move from one time zone to another just a few hours of travel...Again, I touch upon Jetlag and some of the ways to overcome it in another blog..
Yours in health and fitness,
Gareth