Sleep continues to be our most underutilized health-promoting behavior, and sleep loss remains a public epidemic, according to the Centers for Disease Control and Prevention (CDC) and the World Health Organization (WHO). We talked before about why we should be prioritizing better sleep habits. If you need a refresher, check out our previous blog post here. What we don’t always realize, however, is how our choices throughout the day, and the unavoidable realities of modern life, negatively impact our ability to get good sleep. Our brain depends upon a complex internal clock, our circadian rhythm, that signals when it is time to be awake and when we should be asleep. Environmental factors such as daylight and ambient temperature, and internal processes, like the release of melatonin and the generation of sleep pressure, signal our brain to begin pulling us from wakefulness and into the wonderful world of sleep. Unfortunately, much of our modern lives conflict with this intuitive system, leaving many of us sleep deprived. Below we’ll explore some ways we can take control and promote better sleep in our homes.
Turn Down the Lights
The advent of electric light changed the sleep game entirely. In nature, our brains relied upon the rising and setting of the sun to determine when to be awake and when to go to sleep. As the sun set, our brains began releasing melatonin, alerting our bodies that the time to sleep was approaching. Now, we are always surrounded by light and our internal clocks have been turned back two to three hours. Even once the lights are out, we stay on our screens, inches away from the blue light our eyes are most sensitive to. Dimming the lights and avoiding screens for a couple of hours before bedtime is ideal. Otherwise, use blue-light blocking settings or glasses to reduce the impact of screens on your circadian rhythm.
Keep it Cool
Many of our homes are climate-controlled, maintaining a constant room temperature throughout the day. However, a slight decrease in core temperature is necessary for our bodies to initiate and maintain sleep. A cool room helps pull your brain and body towards sleep. Temperature-sensitive cells in the brain pick up on core temperature changes, adding to the message from setting sunlight that it is time to sleep. The release of melatonin, specifically, is controlled by the loss of daylight and the drop in temperature that coincides with sunset. If you’ve ever stuck your foot or leg out from under the covers at night, or noticed your child sleeping this way, this is the body’s way of regulating temperature during sleep.Attempting to release heat through your extremities to maintain optimal sleep temperature. Turn down your thermostat at night, and wear cool, loose clothing to bed to promote sleep. Experts suggest that the optimal room temperature for sleep is around 65 degrees Fahrenheit. Caffeinate with Caution. Our brains produce a chemical called adenosine that builds up during the day, creating what we call “sleep pressure” that peaks at bedtime. Caffeine, the most widely used stimulant, mutes our sleep signal by binding to adenosine receptors in the brain. Caffeine tricks us into feeling awake and alert, while our adenosine levels continue to rise. The problem, however, is that when the caffeine wears off, our brain is hit with all of the adenosine that has built up over the day, resulting in what is often called a “caffeine crash.” Caffeine also lingers in the body for a long time. It takes approximately 5 to 7 hours to break down half of the caffeine we’ve consumed. So, if you drink a cup of coffee at 2 pm, you may still have 50% of the caffeine content in your body at 9 pm. Additionally, many people enjoy a cup of decaf coffee in the evening, not realizing that “decaffeinated” does not mean “caffeine-free.” Decaffeinated products may contain anywhere from 3 to 10% of the caffeine found in a cup of regular coffee. Skip the Nightcap. Some people believe that alcohol helps them fall asleep and sleep soundly throughout the night. Adults may indulge in a nightcap to help them unwind and relax before bed. However, alcohol is a sedative, sedating the brain out of wakefulness, which is not the same as entering a stage of sleep. Brainwave activity during this state is more similar to being under anesthesia than it is to being asleep. Consequently, the state of unconsciousness brought about by alcohol does not provide the cognitive, physical, or emotional benefits associated with sleep. Alcohol also fragments sleep, resulting in brief awakenings throughout the night, often imperceptible to the sleeper. As sleep is not continuous, it fails to be restorative. Alcohol also suppresses the generation of REM sleep. Individuals who drink even moderate amounts of alcohol in the afternoon may inadvertently deprive themselves of this critical sleep stage, resulting in difficulties with learning and memory. Despite the mental, physical, and emotional benefits of good sleep, our society is not adequately designed to optimize this powerful tool. Unified work start times, early school start times, evening activities, after-hours work obligations, and homework have us waking up early and going to bed late. While these things are often beyond our control, taking control of our home environment and practicing good sleep hygiene is something we can do to promote our physical and mental health. Anticipating changes that will impact our sleep, like daylight saving time, switching shifts at work, and traveling, gives us the opportunity to adapt our sleep gradually.
