The ideal safe sleep temperature depends on the age of the sleeper:
Sleeping in Cold Temperatures
Any temperature below 60 degrees Fahrenheit is too cold for people to sleep comfortably. When our bodies are cold, they work hard internally to get warmer. So, as we try to sleep, our bodies are working to warm us through shallow breathing and our cardiovascular system works harder.
The "10-3-2-1-0" sleep rule is a popular time-based method designed to help you wind down and improve sleep quality. It provides structured, actionable milestones to end habits that disrupt your circadian rhythm.
Sleep experts believe the best temperature for great sleep is between 68-72 degrees Fahrenheit. But in addition to making you uncomfortable and interfering with healthy sleep patterns, being too hot at any time of day or night can cause health risks like dehydration and heat stroke.
Japanese people typically sleep in cooler bedroom temperatures, averaging around 55∘F55 raised to the composed with power F𝟓𝟓∘𝐅 (13∘C13 raised to the composed with power C𝟏𝟑∘𝐂) during the winter. Because traditional homes often have low insulation and bedrooms are rarely heated overnight, comfort relies heavily on layering thermal pajamas and using thick, insulating comforters (kakefuton).
Japan's exceptionally low rates of Sudden Infant Death Syndrome (SIDS) are primarily attributed to deep-rooted cultural sleep practices, widespread public health initiatives, and a robust maternal-child healthcare system.
The Netherlands consistently ranks as the country that gets the most sleep globally. Citizens there average about 8 hours and 12 minutes of sleep per night, which is around 24 minutes more than the global norm. New Zealand, Finland, and Australia closely follow in the top rankings.
For most people, 73°F is slightly too warm for optimal sleep, as sleep experts recommend a cooler environment between 60°F and 67°F to signal the body to rest. However, personal comfort varies—older adults may actually sleep better in the 68°F to 74°F range.
Older people frequently wake up at 3 a.m. due to advanced sleep phase (a biological shift where the body clock advances, causing people to get tired and wake up earlier), reduced time in deep restorative sleep, and lower melatonin levels, making them more sensitive to environmental disturbances.
Extreme heat is the leading weather-related killer, causing more fatalities each year globally and in the United States than all other extreme weather events—such as hurricanes, tornadoes, and floods—combined.
Looking at screens before bed
Although we need melatonin-suppressing blue light to keep us alert during the day, blue light at night-time is a big no. Being exposed to blue light right before sleep can have serious impacts on sleep quality and circadian rhythm.
At age 60, experts recommend 7 to 9 hours of sleep per night for optimal health and cognitive function. Getting fewer than 5 hours is associated with a significantly higher risk of developing multiple chronic health conditions over time.
Koalas are thickset arboreal marsupials with a thick grey fur. Found only living in Australia, they mainly live in the eucalyptus trees and spend around 22 hours of their time sleeping (90%). They spend the other 10% of their day eating and sitting around.
It is much healthier to sleep in a cool room rather than a warm one. Medical and sleep experts recommend an ambient bedroom temperature between 60°F and 67°F (15.5°C to 19.4°C) for optimal rest.
Sleeping in a cool 62∘F62 raised to the composed with power F62∘F environment supports your body's natural circadian rhythm, which must drop its core temperature by 1−2∘F to initiate sleep. This specific temperature range prevents your body from overheating, allowing for longer, uninterrupted REM and slow-wave (deep) sleep.
Experts generally recommend setting your house between 60∘F60 raised to the composed with power F𝟔𝟎∘𝐅 and 67∘F67 raised to the composed with power F𝟔𝟕∘𝐅 at night. This cool range mimics the natural drop in your body’s core temperature, which triggers melatonin production, prevents fitful sleep, and helps you fall asleep faster.
If you wake up exactly at 3:00 AM, it isn’t typically caused by a single organ struggling. Scientifically, it is most often the result of a natural cortisol surge (the stress hormone starting to rise) and the liver processing a drop in blood sugar or late-night alcohol.
To improve your sleep, eat foods that boost serotonin and melatonin or contain relaxing minerals like magnesium. Great choices include tart cherries (natural melatonin), almonds (magnesium), kiwis (serotonin), fatty fish (omega-3s), and oatmeal (complex carbs that aid tryptophan absorption).
The Bible does not explicitly mention 3:00 AM, as the specific hour-based clock was not used in biblical times. However, the period between 3:00 AM and 6:00 AM is described as the "fourth watch" of the night. The scriptures often associate waking during these quiet, early hours with divine encounters, intercession, and spiritual awakening.
The "forbidden hour of sleep," also known as the wake-maintenance zone, is a 2–3 hour window before your habitual bedtime. During this time, your brain releases a circadian alerting signal that creates maximum alertness, making it biologically very difficult to fall asleep even if you are tired.
No, 72°F is generally not too hot to sleep, and is actually within the ideal recommended bedroom temperature range (60°F to 72°F). However, personal preference varies; while some consider it the perfect sweet spot, others find it slightly too warm and prefer dipping closer to 65°F.
It takes time for your home to warm up and cool down. If you're not sure how long it takes, try turning the heating on about 30 minutes before you need it. You should turn it off 30 minutes before you'll stop needing it.
"The country that never sleeps" usually refers to Norway or Iceland, which are famous for the "Midnight Sun"—a summer phenomenon where the sun remains visible for 24 hours a day.
Yes. Losing just 10% to 15% of your body weight can dramatically improve or even eliminate mild-to-moderate obstructive sleep apnea. Shedding excess pounds reduces tissue around your neck and throat, relieves pressure on your chest, and significantly reduces airway collapse during sleep.
see more of our stories on Google. The average bedtime for American adults is 11:37pm, and the average duration of sleep is less than 7 hours, Apple Watch data shows. Why it matters: Most people aren't getting the recommended 7 to 9 hours of sleep per night, which impacts mood and health.