Our health - physical and mental - can be impacted when our body's natural circadian rhythms are thrown out of kilter. Keep your body clock on time with natural solutions.
Birds have them. Bees have them. Humans have them too. They're internal clocks that regulate when we go to sleep when we go to bed and many activities in between.
Internal clocks and circadian rhythms
We all have many internal clocks, every bit as synchronized as the most elegant Swiss watch. These clocks are clusters of cells in areas such as the heart, lungs, and liver. The master body clock called the suprachiasmatic nucleus (SNC) is located in the hypothalamus. (An area of the brain that controls the release of a whole host of hormones) including melatonin.
It's melatonin that influences when we sleep and when we wake, and it's closely tied to the 24-hour cycle of daylight. As the light fades, the SNC triggers the release of melatonin, which makes us sleepy. As the sun rises and we are exposed to increasing light, the body inhibits melatonin release. Genes have also been found to influence our daily sleep-wake cycle, called the circadian rhythm.
Thanks to electric lighting, we can prolong our day. But, unfortunately, that puts us at odds with our circadian rhythms, which would naturally have us sleep for more extended periods during winter darkness.
The possible result is a disturbance in our typical sleep-wake cycle, leaving us feeling sluggish, unproductive, and maybe even a little low. As a result, some may experience winter depression, often called seasonal affective disorder.
When the clock goes awry
Since circadian rhythms influence so many of the body's functions, it's no surprise that health can suffer when there's an upset in the body's normal cycle.
Researchers at Columbia University who looked at population studies found that reduced hours of sleep and metabolic problems, such as diabetes, often occurred together. In addition, they concluded that disrupted sleep patterns can lead to the release of stress hormones that, in turn, lead to hypertension and insulin resistance.
Yale School of Medicine studies looking into the genetic control of circadian rhythms found that we have lowered resistance to infection at certain times of the day. Researchers have also found a link between gene mutations that govern circadian rhythms and cancers of the breast, ovaries, and colon.
Sleep-wake cycles not only have an impact on physical health but also play a part in mental health.
For example, the existence of seasonal affective disorder has become well known. What's less well known is that other mental illnesses are also linked to the body's sleep-wake cycles. For example, those with depression, bipolar disorder, and schizophrenia often experience severe circadian rhythm disruptions, a symptom thought to be linked to genetic control of the body's internal clock.
Beating the clock
Penny Johnson has been coping with winters in Canada's extreme north since 1981 when she and her husband moved to Inuvik, Northwest Territories. Known as the "land of the midnight sun," it's also known for its long winter nights. During the most extended periods of darkness, says Johnson, the light would appear as only a short period of dusk.
"I think it's important to get out of the house and add some type of activity to keep you active, to provide you with a different option than going home and hunkering down in front of the television," says Johnston.
She and her husband arranged their work schedules to get out for a ski-in that dusk period. In addition to staying active, the couple planned regular get-togethers with friends to avoid spending hours cooped up in their house.
Now living in Yellowknife, Johnson says there are more leisure opportunities in winter, including a sizeable well-lit recreation center where she can go for an indoor jog in shorts and a T-shirt. In addition, she and her husband have embraced the outdoors, enjoying cross-country skiing, skidooing, and hunting.
Johnson admits, however, that the darkness can become oppressive. So she ensures her family eats a balanced diet and takes vitamin D supplements. She also recommends, for those who can, taking a mid-winter holiday to a warm location.
Sometimes our schedules just can't follow our body's natural clock, whether we're working the night shift, caring for a newborn, or traveling across time zones. Scheduling daily activities so they're in sync with our circadian rhythms, whenever possible, can help us feel healthy and get the most out of our days.
Morning light cues the body to slow melatonin production. Our body temperature starts to rise, and our digestive system becomes more active as we wake up. Mornings are generally when concentration, alertness, and memory are at their height, so it's a good time to do your most challenging work and save more manageable tasks for later in the day.
In the afternoon, coordination, reaction time, muscle strength, and circulation are at their peak, making it an excellent time to book a squash game, take a fitness class, or go for a walk. In mice, exercise has been found helpful for keeping circadian rhythms on track, especially in advanced age. However, for some people, physical activity too close to bedtime may actually make falling asleep more difficult.
As daylight fades, melatonin is released, and we start to feel sleepy. We can make the most of that effect by creating a bedtime ritual—a quiet time with a book, herbal tea, some calming music. A light evening snack, such as cheese and whole-grain crackers, can help you take advantage of that melatonin mellowness, improving your chances of restful sleep.
Our circadian rhythms perform wondrous feats every day, coordinating body chemistry and functions' daily ebb and flow. Factors such as artificial light, travel, and even the changing seasons can affect those natural cycles. Doing what we can to support our sleep-wake cycles can be crucial for maintaining good health and ensuring that we're well-rested and energized so we can enjoy life.
Adapting with adaptogens
Bev Gray, herbalist, and author of The Boreal Herbal (Fitzhenry & Whiteside, 2013), is well acquainted with extreme seasonal light and dark effects. As the Aroma Borealis Herb Shop owner in Whitehorse, Yukon Territory, she prefers to use herbs found locally. To build resistance to the stress and fatigue that can accompany dark days of winter, she recommends Rhodiola Rosea, which can be found in most health food stores.
Rhodiola, says Gray, is an adaptogen. As the name suggests, they are plants that help us adjust to changes, such as those we see with the seasons.
Note: Rhodiola is not recommended for pregnant or breastfeeding or for those with bipolar disorder.
Other helpful herbs
- Melatonin is a hormone secreted by the pineal gland. It is associated with sleep and circadian rhythms and is used to treat insomnia, significantly when associated with altered sleep schedules.
- Ashwagandha is classified as an adaptogen and is used to help treat low energy, fatigue from physical exertion, difficulty sleeping, and anxiety.
- Always consult your health care practitioner for advice on supplements and dosages that are right for you.
WRITTEN BY JOSE PADRO