How the Changing Seasons Affect Your Sleep and How to Adapt
Sleep is vital to our health, mood, cognitive performative, work quality and social life. Given the importance of sleep, it’s a good idea to prioritise getting enough of it. But did you know that external factors caused by the changing seasons can drastically impact your sleep quality?
Sleep doesn’t just happen in isolation. It is deeply influenced by the world around us, particularly by the changing seasons.
As the Earth transitions from winter to summer and back again, seasonal sleep changes such as daylight hours, temperature and humidity can significantly impact our ability to get a restful nights’ sleep.
These environmental changes interact with our body’s internal systems, particularly the circadian rhythms which act as our natural sleep-wake cycle.
The good news is that these seasonal sleep changes don’t have to leave you sleep deprived. By understanding how changes in daylight, temperature and humidity affect your sleep, you can adopt practical strategies to combat these disruptions.
Whether it’s adjusting your room’s temperature, trying a hot water bottle, using black out curtains, or investing in a humidifier, simple solutions like these can make a big difference.
In this blog, we’ll take a closer look at exactly how seasons affect sleep and provide actionable tips to help you rest, no matter the time of year.
Winter Seasonal Changes
Shorter Days Impact on Sleep
The shorter daylight hours experienced in winter can significantly impact sleep quality.
Ever wonder why am I so tired in winter?
Well, any time your exposure to sunlight is reduced, your circadian rhythms are affected. Circadian rhythms are mental, physical, and behavioural changes that follow a 24-hour cycle. They are your internal body clock, regulating how alert or how sleepy you are.
The impact of the sun’s shorter shifts means you lose more time with the most natural source of vitamin D there is, the sun.
As natural daylight diminishes, our bodies produce more melatonin, the hormone responsible for regulating sleep. As your brain produces more of this hormone, you may find yourself unusually sleepy or drowsy earlier in the evening during the winter.
To combat the lack of sunlight experienced in the winter months, try soaking in the sun during the mornings and afternoons by getting out on a walk.
Alternatively, vitamin D supplements are a great way to ensure your body gets enough vitamin D and promote a more restful nights’ sleep.
Colder Temperatures and Sleep Quality
Sleep and temperature go hand in hand. Generally, sleeping in the cold is conducive to better sleep as it helps lower your body temperature which promotes deeper and more restful sleep.
However, if the room temperature is too cold, it can lead to discomfort, making it harder to fall asleep or stay asleep throughout the night.
It’s therefore important to find a balance. Sleep experts say temperatures between 15 to 21 degrees Celsius (60 to 70 degrees Fahrenheit) are optimal for a night of good, deep sleep.
This temperature window ensures that your core temperature won’t dramatically rise as you sleep, as an increase in body heat can sometimes trigger the body to wake up and you become too hot to sleep.
Obviously, cooler indoor temperatures are more attainable during the winter when it’s colder outside.
If these temperatures are a bit too chilly for your liking though, try cosying up under a weighted blanket or with a luxury faux fur hot water bottle. Not only are hot water bottles effective for warming your bed in winter, but they help relax muscles and relieve tension helping us feel sleepier.
Check out our guide to hot water bottles for more information.
Dry Air Sleep Challenges
Air that is too dry can make it more difficult to breathe at night. During winter, the air is already drier as is, and sometimes cranking up your indoor heating system can make matters worse.
Air that is dry can lead irritated nasal passages, sneezing, coughing, an itchy throat and may even increase suffering from colds and other viruses. This in turn can lead to snoring which makes sleeping difficult.
Fortunately, you don’t have to settle for a dry and uncomfortable sleep environment in the winter months. To combat this, one of our best winter sleep tips is to consider using a humidifier in your bedroom.
This can help maintain a more comfortable moisture level in the air, promoting better sleep and overall comfort. What’s more, this may seem like obvious advice, but making sure that you are hydrated before bed is very effective at combatting the effects of dry air.
Seasonal Affective Disorder (SAD)
SAD is a type of depression that occurs at the same time each year, often beginning in late autumn or early winter. Research studies have found that SAD is likely to result from a complex interplay between environmental, biological, and psychological factors.
People with SAD often feel excessively sleepy during the day and sleep longer than usual at night. You may have difficulty waking from a long sleep or feel the need to nap repeatedly throughout the day.
Although SAD usually resolves itself within a few months when the seasons change, there are treatment options available.
The most common treatment is light therapy. During light therapy, a bright artificial light mimics sunshine exposure that’s missing during winter months.
Going outdoors, getting regular exercise, eating healthily, and engaging in social interactions may also reduce symptoms.
Summer Challenges
Longer Days and Changes in Sleep Length
On the other end of the spectrum, the longer days experienced in summer can significantly impact sleep quality due to increased exposure to natural light during the morning and evening hours.
When it gets dark, our body clock signals that it’s time to sleep with the release of the hormone melatonin. As the sun comes up, melatonin secretion stops so the body can prepare for the day.
With the longer daylight hours in summer, the time of melatonin secretion is shorter than in winter. This can disrupt the body’s internal clock making it harder to fall asleep at the usual time and often causes us to wake up earlier.
A practical summer sleep solution to counteract this issue is adopting the use of blackout curtains.
These specifically designed curtains block out external light, creating a dark environment that promotes the production of melatonin and signals to the body that it is time to sleep.
By reducing light exposure, blackout curtains can help maintain a consistent sleep schedule, ensuring that the longer summer daylight hours do not interfere with the quality of your sleep.
Warmer Temperatures Causing Negative Restorative Sleep
In addition to longer daylight hours, warmer temperatures can also play a part in disrupting sleep.
Studies have shown that heat exposure has a negative effect on slow-wave sleep (SWS) and rapid eye movement sleep (REM), whereas cold exposure does not affect sleep stages.
The body needs to be cool to sleep because it helps you fall and stay asleep and it triggers the release of melatonin, the “sleepy hormone”.
Given that melatonin, sleep and temperature are linked, we know that higher temperatures prevent the body from cooling down and can affect how much deep sleep you get.
One of the best tips for how to keep cool at night, and to get a better nights’ sleep, is to keep your bedroom temperature low with a fan or by opening a window.
We all have a slightly different temperature preference so you may have to play around to find the temperature that works best for you.
You also need to consider that your clothing and bedding will impact how hot or cold you are at night. Your bedding is going to play a big role in how hot or cold you feel in bed, so it’s worth getting the balance just right.
If you find yourself waking up with the covers thrown to one side, you may need to consider switching things up.
You can match the type of sheets on your bed to the season you’re in and your personal preferences. We recommend opting for breathable bedding like bamboo bedding and lightweight sleepwear.
As we have discussed, the changing seasons can have a profound impact on our sleep patterns and overall sleep quality.
Seasonal sleep changes such as temperature, daylight hours and humidity can influence how well we sleep. By understanding these changes, we can take proactive steps to create an optimal sleep environment to suit each season.
The team at Zleepy are passionate about all things sleep-related and we believe that being mindful of our sleep surroundings can help us maintain a consistent and restorative sleep schedule throughout the year.
Check out our full range of sleep products designed to help you get the best nights’ sleep possible.