★ TL;DR
- 60–67°F, roughly 16–19°C, is a commonly recommended starting range. It is general guidance, not a prescription or a guarantee of deep sleep.
- Older-adult research complicates that advice. One small observational study found better sleep efficiency at 68–77°F, or 20–25°C, with substantial variation between people.
- Start with what you can change cheaply. A lighter cover or a modest thermostat adjustment is a more sensible first experiment than an expensive cooling system.
- Feeling comfortable but sleeping poorly is a different problem. Persistent difficulties deserve attention beyond the thermostat.
Cool bedrooms can help. But a thermostat guideline is a starting point, not a commandment, especially when it leaves you shivering.
Educational information, not medical advice. This guide is for adults. Persistent sleep difficulties, breathing pauses, severe daytime sleepiness, or recurring unexplained night sweats warrant medical advice.
You wake at 3 a.m. with a damp neck and the duvet kicked into exile. The thermostat says 72°F. Your side of the bed appears to have developed its own climate.
The usual advice is to cool the room. Reasonable enough. Then the internet turns a useful suggestion into a biological commandment: find the correct number or surrender your deep sleep.
The evidence is less obedient. There is no single bedroom temperature that guarantees good sleep for everyone. The practical aim is a setting and bedding combination that lets you rest without feeling overheated or cold.
60–67°F, roughly 16–19°C, is a commonly recommended starting range. It is general guidance, not a prescription or a guarantee of deep sleep.
Older-adult research complicates that advice. One small observational study found better sleep efficiency at 68–77°F, or 20–25°C, with substantial variation between people.
Start with what you can change cheaply. A lighter cover or a modest thermostat adjustment is a more sensible first experiment than an expensive cooling system.
Where the familiar temperature range comes from
The National Sleep Foundation recommends a bedroom temperature of 60–67°F as part of its general sleep guidance. That is a useful answer to “Where might I start?” It is a much weaker answer to “What must every human sleep at?”
Your body temperature normally declines around the transition to sleep. A bedroom that feels excessively warm can make settling down uncomfortable, but the thermostat does not operate a switch marked DEEP SLEEP.
If you already sleep comfortably at 70°F, this article is not an eviction notice. If you feel cold at 65°F, you do not need to endure it to demonstrate your commitment to science.
The sensible distinction is between guidance that helps you experiment and a rule that tells you to ignore your experience. Wellness advice has a habit of crossing that line while carrying a shopping bag.
Why the older-adult study matters
A 2023 study by Amir Baniassadi and colleagues examined bedroom temperature and sleep in older adults living at home. It found the most efficient and restful sleep, overall, between 68 and 77°F, or 20–25°C.
The project collected nearly 11,000 nights of observations from 50 participants, according to the research institution’s account. That is repeated observation of a small group, not a trial involving 11,000 different sleepers.
The study also associated an increase from 77 to 86°F with a 5–10% decline in sleep efficiency. Sleep efficiency means the proportion of time in bed spent asleep. It is not the percentage of sleep spent in deep NREM sleep.
These were observational findings, with substantial differences between individuals. They do not establish that turning up the heat improves sleep, or that every person over 65 should adopt the same range.
The useful lesson is narrower: the familiar colder-bedroom recommendation does not settle the question for everyone. Someone who feels cold at 65°F has good reason to try a more comfortable setup, rather than assume their biology is failing an internet standard.
Your duvet has a climate policy
Room temperature is only part of the experience. A thermostat measures air at its sensor; it does not measure what it feels like beneath your particular combination of pajamas, sheets, blankets, and mattress.
Before changing the whole room, look at the layer nearest the problem. A heavy cover is easy to remove and put back. An expensive mattress is considerably less cooperative.
Try one inexpensive adjustment:
- Waking too warm? Try a lighter cover before buying new equipment.
- Waking cold? Try a light additional layer or a modestly warmer setting.
- Sharing a bed with someone who disagrees? Separate covers let each person adjust without renegotiating the household climate treaty.
- Comfortable but awake? Consider whether light, noise, worry, pain, or another issue deserves more attention.
For the broader environmental picture, HNI’s guide to creating a sleep-friendly bedroom covers light and sound as well as temperature.
Cooling a home costs money. Advice that assumes everyone can run air conditioning all night confuses an adjustable habit with an available resource. Start with the changes you control; a difficult room is not a personal failure.
Tool: Find one change worth keeping
Purpose: Identify whether a manageable change to your bedroom setup seems helpful. This worksheet is a practical observation aid, not a validated treatment protocol, diagnostic test, or way to measure deep sleep.
Use paper or a note on your phone. Make a brief entry in the morning; there is no need to watch the clock through the night.
Copy this entry for each night:
- Room temperature, if known: ______
- Covers and sleepwear: ______
- When I woke, I felt: hot / cold / comfortable / unsure
- Morning impression: less rested / usual / more rested
- Anything unusual, such as noise, stress, or illness: ______
How to use it:
- Note your usual setup for a few nights, provided it feels comfortable and safe.
- Choose one change, such as a lighter blanket or a small thermostat adjustment.
- Keep the other parts of the setup reasonably similar for several nights. Stop or reverse the change if it makes you uncomfortable.
- Compare the overall pattern. One wonderful night or one dreadful night cannot tell you much on its own.
Turn the result into a next step:
- Mostly too hot: Keep a helpful lighter layer, or try a modest cooling adjustment if available.
- Mostly too cold: Restore warmth with a comfortable layer or a modest warming adjustment.
- Mostly comfortable, still sleeping poorly: Stop treating temperature as the only suspect. Consider discussing persistent difficulties with a healthcare professional.
- No clear difference: Return to the simpler or less costly setup. An inconclusive experiment does not justify a shopping spree.
You do not need a wearable to use this worksheet. It asks about comfort and how you feel, not whether an algorithm awards your night a respectable grade.
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Quick reader quiz: Does that claim deserve a raised eyebrow?
Choose an answer before reading the explanation. This checks understanding, not your health; no score diagnoses a sleep problem.
1. Does sleeping at 65°F guarantee more deep sleep?
Answer: No. A general temperature recommendation cannot promise a particular sleep stage for an individual.
2. Should individual comfort influence how you use the older-adult findings?
Answer: Yes. The study found a group-level association across a range, with individual variation. It did not test a universal thermostat prescription.
3. You feel comfortable but keep waking. Is further cooling automatically the best next step?
Answer: No. Temperature may not be the main contributor. Use the worksheet to guide a limited experiment, then widen the inquiry if poor sleep persists.
What to do with your answers: If any surprised you, begin with one inexpensive adjustment rather than buying equipment. If all were familiar, use that understanding to resist advice that promises certainty the evidence cannot supply.
When the thermostat is not the whole story
Being comfortable matters. It does not rule out a sleep disorder or another health concern. The National Institute on Aging identifies insomnia and sleep apnea among the sleep problems that become more common with age.
Seek medical advice if sleep problems persist or interfere with daily life, especially with loud snoring, observed breathing pauses, gasping, or significant daytime sleepiness. The NHS also advises getting recurring night sweats checked, particularly when clothes or sheets become soaked despite a cool sleeping environment.
Keep a short account of the pattern and any recent medication changes to discuss with your clinician. Do not stop a prescribed medicine on the theory that it must be responsible.
Better sleep belongs within physical wellness and recovery, but it should not become another nightly examination of personal worth. You cannot bully an involuntary process into performing on schedule.
Frequently asked questions
Is 24°C too hot for a bedroom?
Not automatically. That is about 75°F, within the range associated with better sleep in the older-adult study. Some people will find it warm; others will feel comfortable. Consider your bedding and actual experience rather than declaring the number universally wrong.
Is it better to sleep with socks on?
If cold feet bother you, comfortable socks are a reasonable option to try. A small study of six young men found improvements in some sleep measures with bed socks, but it does not establish a reliable benefit for older adults or a treatment for insomnia.
Should I keep lowering the temperature until I sleep through the night?
No. Shivering is a reason to change the setup, not proof you are approaching a breakthrough. MedlinePlus recommends experimenting with the thermostat and blankets to find a comfortably cool environment, without making yourself cold.
Do I need a smart thermostat or cooling mattress?
Not to begin. Use your existing covers, sleepwear, and room controls to test whether comfort improves. Consider a purchase only if you can name the problem it would solve, its cost, and a return policy that lets you judge it at home.
Can I use these suggestions for a baby or toddler?
This guide addresses adults. Infant sleep safety requires separate guidance, including avoiding overheating and unsafe bedding. Consult NIH Safe to Sleep guidance and your child’s clinician rather than transferring adult blanket advice to an infant.
Tonight: Make one manageable change
Choose a lighter cover if you wake hot, a comfortable additional layer if you wake cold, or a modest room adjustment if you can make one. Note the result for several mornings and keep what seems useful.
If you are already comfortable and still struggling, widen the inquiry. The aim is a bedroom you can sleep in. It does not need to become a laboratory with decorative pillows.
