Cold Nights, Better Sleep? How Temperature Affects Sleep Quality

Why Your Body Needs to Cool Down

As the day winds down, your body begins a natural cooling process known as thermoregulation, signalling that it’s time for sleep. This gradual drop in core temperature helps you fall asleep faster and move into deeper, more restorative stages of rest. If your environment is too warm, this process can be disrupted, making it harder to settle and stay asleep through the night. Research suggests that even small increases in bedroom temperature can lead to more frequent waking and lighter sleep, highlighting how closely temperature and sleep quality are linked¹. This is why many people notice they sleep more soundly during cooler months, when the environment better supports the body’s natural rhythms.

Finding Your Ideal Temperature

While comfort can vary slightly between individuals, most adults tend to sleep best in a room between 16 and 20°C. This range supports the body’s cooling process without causing discomfort from being too cold². Temperatures above this range may interfere with sleep onset, while excessively cold environments can also be disruptive, as the body works harder to maintain warmth³. The goal is not to make your bedroom cold, but to create a stable, slightly cool environment that allows your body to regulate itself efficiently. This balance is especially important for maintaining uninterrupted sleep across the night.

Simple Ways to Stay Comfortable on Cold Winter Nights

Creating the right sleep environment during winter is less about cooling the room and more about maintaining a steady, comfortable temperature that supports your body’s thermoregulation. A few practical tips to maintain an ideal environment include layering your bedding so you can easily adjust warmth throughout the night and choosing breathable materials like cotton or wool that help regulate body heat without causing overheating. While it may be tempting to heavily heat the room, keeping your bedroom within the ideal temperature range of around 16–20°C can prevent the air from becoming too dry or stuffy, which can disrupt sleep. If needed, a heater can be used to take the chill off before bed, but it’s often best to lower or switch it off overnight. Reducing draughts with proper insulation or closing doors can help maintain a consistent temperature, while still allowing for some airflow. For couples, different warmth preferences can become more noticeable in winter, so options like separate blankets can help each person stay comfortable without interrupting sleep³.

A Small Change with a Big Impact

Temperature is often overlooked when thinking about sleep, yet it plays a central role in how well you rest. Cold nights don’t automatically guarantee better sleep, but they can make it easier to achieve your ideal temperature and support healthy thermoregulation. If you regularly experience disrupted sleep, night-time discomfort, or ongoing fatigue despite adjusting your environment, it may be worth speaking with a health professional. Addressing underlying sleep concerns can help you move beyond temporary fixes and support better sleep - and overall wellbeing - in the long term.

How Sove CPAP Clinic Can Help

Founded in 2008, Sove CPAP Clinic has grown to become a leading provider of respiratory and sleep services and products in Australia, with over 90 clinics nationwide. Our comprehensive clinical team includes Respiratory & Sleep Specialists, Sleep Technologists, and CPAP Consultants, ensuring you receive personalised care. All medical procedures, including sleep studies and lung function testing, are bulk billed to all Australians, with minimal wait time.

If you would like to speak to a Respiratory & Sleep Physician, book a bulk-billed sleep study, or seek advice for sleep apnea, you can reach us at 1300 76 29 39 or info@thecpapclinic.com.au.

ALWAYS FOLLOW THE DIRECTIONS FOR USE. CPAP is used for Obstructive Sleep Apnea treatment. When considering whether a sleep study or CPAP is right for you, speak to your doctor. Medicare criteria and T&Cs apply.

References:

1. "The Key Role of Temperature in Sleep Quality.” Psychology Today, 2025, www.psychologytoday.com/us/blog/the-modern-brain/202503/the-key-role-of-temperature-in-sleep-quality?msockid=1658b14c6ed66fa82e2ba6756f226e1f. Accessed 22 Apr. 2026.

2. Resmed. “Hibernating This Winter: How Does Temperature Affect Sleep?” Resmed.co.nz, Resmed, 28 May 2017, www.resmed.co.nz/blog/temperature-sleep-hibernation. Accessed 22 Apr. 2026.

3. “What Temperature Is Too Cold to Sleep In?” Biology Insights, 10 Dec. 2025, biologyinsights.com/what-temperature-is-too-cold-to-sleep-in/. Accessed 22 Apr. 2026.