The Science Behind a Better Night’s Sleep
Oct 26, 2016
1. Establish a consistent bedtime ritual.
Many functions in the body are controlled by your central nervous system (CNS). Your CNS has different “divisions,” each with different roles. Two of these division—the sympathetic and parasympathetic nervous systems—have a dramatic effect on your ability to get a good night’s sleep. While the sympathetic division increases your level of alertness and excitability, the parasympathetic calms you down.
To meet the demands of your day, your sympathetic nervous system often takes the reigns so you stay “fired up.” Obviously, when it comes to getting to sleep, you need the parasympathetic to take over so you can calm down.
When you do things prior to bedtime that demand the sympathetic nervous system to be active (e.g., check emails, play video games, or watch graphic television) your brain thinks you need to stay awake.
Hand-held devices that utilize blue light to illuminate the screen can actually trick your brain into thinking it’s daytime, so you don’t get a release of the sleep-inducing hormones (like melatonin). In this case, it’s harder to fall asleep and stay asleep (Chang et al., 2014).
Prior to bedtime, develop a ritual of activities that do not cause a stress response. Avoid stressful phone calls, emails or interactions, if possible. Dimming the lights, deep breathing and other calming activities such as yogacan stimulate the parasympathetic nervous system to help you get to sleep.
Going to bed at the same time every night and getting up at the same time every morning can help regulate how and when your sympathetic (you want this to help wake you up) and parasympathetic (you want this to calm you down) nervous systems are impacting you (Strine and Chapman, 2005).
2. Limit caffeine and alcohol.
We are a caffeinated society and, as caffeine consumption rises, there is a concurrent rise in sleep disorders.
Caffeine functions to trick the brain by blocking the neurotransmitters that are responsible for making you tired. When this happens, your sympathetic nervous system takes control and makes you alert and excited. Despite the negative affect on sleep, it’s estimated that roughly 70% of people consume caffeine in the evening, prior to bedtime (Drake et al., 2013; Penolazzi, Natale and Russo, 2012).
The maximal effects of caffeine lasts for about four hours, but this time period may double in some people. To decrease the negative effects of caffeine on sleep, refrain from caffeine intake at least six hours prior to sleep.
Alcohol in high doses is recognized by the body as a poison and disrupts a variety of physiological functions, including sleep. In elevated doses, alcohol acts as a narcotic on the brain, creating a temporary “shut down” that allows some people to get to sleep.
Unfortunately, this narcotic effect lasts for a relatively short period of time. When it wears off, the brain must attempt to restart the natural sleep cycle, which interferes with one’s quality and quantity of sleep.
Additionally, the perceived poison in the body prevents the adequate release of essential hormones and neurochemicals necessary to recover and wake up feeling rested.
To get better sleep, keep alcohol intake to a minimum, particularly in the evening, and avoid it within two hours of your intended sleep time.
3. Exercise during the day.
In addition to benefiting other aspects of health, regular exercise can help increase the quality and quantity of sleep (Liu et al, 2016; Youngstad, O’Connor and Dishman, 1997).
Moderate to intense exercise triggers a variety of physiological interactions that increase alertness, both during and immediately after exercise, and contribute to a great quality of sleep hours afterward.
Possible factors that link exercise to better sleep include:
Thermoregulation: Exercise increases body temperature during the day, which appears to create a more dramatic decrease in body temperature when sleeping, allowing for deeper sleep cycles.
Energy expenditure: Rest after physical exertion is part of the natural cycle of daily life. When we do not exert ourselves physically during the day, this cycle can be disrupted.
It appears that people who challenge themselves physically every day sleep more naturally (Youngstad, O’Connor, Dishman, 1997).
Performing 20-60 minutes a day of moderate to vigorous exercise can improve both sleep and overall health.