Creating a "Sleep-Friendly" Bedroom: The Environment Affects Sleep More Than You Think

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We often say, "A good horse needs a good saddle." Good sleep needs a good environment too. You may not realize that light, temperature, sound, and bedding in the bedroom all directly affect sleep quality. When it comes to sleep, in a comfortable bedroom, you may sleep more soundly and deeply. In a noisy, bright bedroom, no matter how tired you are, it is usually hard to fall asleep. Today, let's look at how to make low-cost changes to create a "sleep-friendly" rest space.

A bedroom suitable for sleep needs four things: dark, quiet, cool, and comfortable. None can be missing. These four elements are the core of a good sleep environment.

The first element is light. The darker, the better. Darkness is the "switch" for sleep. Our brain has a body clock that regulates melatonin secretion according to light and darkness. The brighter the light, the less melatonin is released, and the more awake we feel. The darker it is, the more melatonin is released, and the sleepier we become. To improve this, install blackout curtains. This is the most important step. Choose thick curtains with good blackout performance to keep out streetlights, car lights, and morning light. Turn off all small light sources. Charger indicator lights, air conditioner displays, and night lights in the bedroom can also affect sleep. You can cover indicator lights with tape, and try not to use a night light. Set your phone to Do Not Disturb and keep it away from the bed. The blue light from a phone screen is a sleep killer. One hour before bed, put your phone somewhere far from the bed, set it to Do Not Disturb, and avoid being disturbed by notification sounds and light.

The second element is sound. The quieter, the better. Use white noise to fight interference. A quiet environment helps the brain relax quickly, while noisy sounds can interrupt sleep, especially during light sleep. To improve this, block outside noise. If there is road noise or public square-dance music outside the window, you can install double-glazed windows or use earplugs. Choose soft foam earplugs; they block sound well and are not uncomfortable. Use white noise to mask interference. If outside noise cannot be fully blocked, use a white noise machine or play white noise audio on your phone. White noise is a steady, monotonous sound that can cover other messy sounds and help calm the brain. Rain, wind, and fan sounds are all good white noise.

The third element is temperature. 18–22°C is the "golden temperature" for sleep. Many people do not know that temperature also has a big effect on sleep. If the bedroom is too hot, people tend to sweat and feel restless, making it hard to fall asleep. If it is too cold, the body curls up and sleep is not restful. Scientific research shows that the human body has the best sleep quality in an environment of 18–22°C. This temperature slows metabolism and lowers heart rate, making it easier to enter deep sleep. To improve this, use an air conditioner or fan in summer. On hot summer days, set the air conditioner to around 26°C. Do not set it too low, to avoid catching a cold. You can use it with a fan to keep the air moving and make you feel more comfortable. In other words, when you first turn on the air conditioner, you can lower the temperature appropriately. After the room temperature drops, set it back to 26°C, and then use a fan. This also saves electricity. In winter, use a thin quilt, and do not cover up too heavily. Many people like to use thick quilts in winter. A thick quilt feels safe and comforting, but the result is often waking up hot in the middle of the night. So the best choice is a thin quilt with good warmth that keeps the body warm without making it stuffy.

The fourth element is bedding. Comfortable bedding is a bonus for good sleep. Mattresses, pillows, and other bedding directly affect how comfortable we are when sleeping, especially for middle-aged and older adults. Choosing the right bedding can greatly reduce backaches and body aches. To improve this, choose a mattress with medium firmness. Do not choose a mattress that is too soft. A mattress that is too soft gives no support to the lower back, and you may wake up with back pain. Do not choose one that is too hard either. A mattress that is too hard presses on the bones and muscles and affects blood circulation. Many mattress stores now have offline experience stores. It is best to go to a store and lie down to try one out and choose a mattress that suits you. Choose a pillow with a suitable height. The height of the pillow should allow the cervical spine to relax naturally, generally about the height of one fist. If middle-aged and older people have cervical spine problems, they can choose a memory foam pillow, which fits the curve of the cervical spine and provides better support. Choose pure cotton sheets and duvet covers. Pure cotton is breathable and absorbs sweat, making sleep more comfortable. Avoid bedding made of synthetic fibers, which can trap sweat and cause static. A small reminder: only labels that say "pure cotton," "100% cotton," "cotton 100%," or "all cotton" mean they contain only cotton fiber and no other ingredients.

The last important suggestion is to declutter the bedroom: the bed should only be used for sleep. Many people like to play on their phones, watch TV, eat, or work in bed. This makes the brain form a conditioned reflex: bed = entertainment and work, not bed = sleep. Over time, even when you want to sleep, your brain becomes active as soon as you lie down. To improve this, move the TV and computer out of the bedroom, and do not binge-watch shows or play games in bed. Do not eat in bed, especially sweets and greasy foods. Before bed, only do sleep-related things in bed, such as reading paper books, not e-books, or listening to music.

Try making some small changes to your bedroom. Make it more comfortable and your sleep quality better.