As you’ve probably heard - exposure to computers, TVs, and phones in the hours before bed can interfere with your sleep. BUT did you know that exposure to sunlight during the day can help you sleep better at night? The thing is... most of us don’t get enough!
Most people have been catching onto the fact that nighttime exposure to computers, tablets, and TV screens sabotages our sleep - the blue light they emit suppresses our sleep hormones - like melatonin.
Research shows that, even during summer, the average person only spends 1-2 hours a day outside. I can only imagine the average for those of us living at higher latitudes. AND for shift workers, it’s even worse.
A Finnish study observed two groups - one living under fluorescent lighting and another group exposed only to sunlight through windows every day. While both groups received the same duration of both light and darkness during the study, the group exposed to sunlight produced significantly more melatonin.
It’s not that the artificial light was detrimental (in this study) - but it simply wasn’t strong enough. The sunlight was more than 7x brighter than the fluorescent light. This is what boosted melatonin production. Researchers assert the importance of our circadian rhythm with variation of light throughout the day, from dawn to dusk - this also supports healthy melatonin production.
During a sunny day, LUX levels (which measure the intensity of light) reach 50,000. Compare this to indoor lighting, which ranges in the low-to-mid hundreds, at the most. For most of human history we have lived with natural light and it plays a significant role in the function of the body and brain.
Why Melatonin + Light Rhythms Are SO Important
Anyone who has suffered through insomnia and sleep deprivation will understand the importance of sufficient and quality sleep.
However, melatonin and our sleep-wake cycle (also called circadian rhythm) are intertwined with every system in the body, affecting much more than how rested or tired we feel. Heaps of studies point to the importance of a healthy sleep-wake cycle for overall immune, hormonal, and mental health.
For instance, one study found that women suffering from PMS (and PMDD) show chronically low melatonin levels. Just two hours a day of exposure to sunlight increased their melatonin levels and relieved their symptoms.
A German study showed subjects with mood imbalances exhibited healthier serotonin levels after just one week of light therapy.
Another study showed subjects experienced a 160% (!) increase in melatonin at night after just a half-hour of exposure to bright light from a light box.
Getting Enough Outdoor Light in an Indoor World
It’s not easy getting enough sunlight when you’re indoors all day working, going to school, or caring for kiddos, BUT it’s vital for healthy sleep, brain function, and metabolic function to get enough light exposure.
Some solutions are obvious - spend time outside as much as you can. Eat lunch outside and go for a walk on your breaks. Maybe you can even work outside on your laptop if you’re a digital nomad.
If possible, work near windows that get plenty of natural light. One study showed employees working near a window received twice as much light as their coworkers who didn’t, and hence, enjoyed more sleep.
If sufficient exposure to natural light isn’t possible, indoor light therapy has been shown to help relieve sleep and mood imbalances.
Look for a light box that delivers plenty of LUX and is big enough for sufficient exposure, or try out one of my favorite biohacking devices called the Human Charger. The Center for Environmental Therapeutics provides criteria for purchasing a reliable light box, which they recommend using for at least a half-hour first thing in the morning.
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