The Best Temperature for Sleep, and How to Actually Hit It

Most people set their bedroom a few degrees too warm without realizing it. Getting the best temperature for sleep isn't about buying anything new: it's about understanding the range your body actually needs, then closing the gap between that range and what your thermostat says right now.

Key Takeaways

• The ideal room temperature for sleep is 60°F to 67°F (15°C to 19°C) for most adults, per Cleveland Clinic, a few degrees cooler than the average home thermostat setting.

• Babies, toddlers, and older adults typically sleep better a bit warmer than that range, not colder.

• Temperature is only one lever. Airflow, humidity, and how heavy your bedding is matter almost as much as the number on the thermostat.

• Colder isn't automatically better. Once a room drops much below 60°F, you're trading sleep quality for plain discomfort.

• Small, low-cost changes, like a fan, breathable sheets, or a scheduled thermostat, usually get you closer to the ideal range than running the AC all night.

Why a Cool Room Helps You Fall Asleep

Thermoregulation is your body's built-in process for keeping its internal temperature inside a narrow, stable range. It's the reason a cool bedroom helps you drift off faster and a warm one keeps you shifting around under the covers.

About two hours before your usual bedtime, your core body temperature starts to drop as part of your circadian rhythm, the internal 24-hour clock that tells your body when to feel alert and when to wind down. That drop is a signal to your brain that it's time to sleep. A cool room lets the drop happen on schedule; a warm room slows it down.

Dr. Drerup describes heat as "a huge disruptor" for REM sleep, and notes that staying in the restorative, slow-wave stages of sleep depends on this same thermoregulation process working properly. This is also why the temperature question keeps coming back to the same range: it's tied to a process your body runs every single night, not just a preference.

Ideal Sleeping Temperature by Age

The ideal range shifts a few degrees warmer at both ends of life. Babies, toddlers, and older adults generally sleep better above the adult range, not below it.

Is 65 Degrees Too Cold to Sleep In?

No. 65°F sits comfortably within the 60°F to 67°F ideal range for most adults, so it's usually a good setting rather than a problem. If it feels too cold, that's more often a bedding issue than a thermostat one: a heavier comforter or warmer pajamas solves it without pushing the room temperature up.

Is 72 Degrees Too Warm to Sleep In?

For most adults, yes. 72°F is at least 5 degrees above the top of the 60°F to 67°F range that supports an easy, uninterrupted night, which means your body has to work harder to bring its core temperature down before sleep can set in. It's not dangerous, just warmer than what tends to produce your best sleep.

Is 75 Degrees Too Hot to Sleep In?

Yes, for nearly everyone. At 75°F, you're well outside the ideal range, and that's the temperature zone where sweating, restlessness, and waking up in the middle of the night become common. If your bedroom regularly sits here, prioritize airflow and lighter bedding before anything else on this list.

What Happens When the Room Is Too Hot

A hot room keeps your body from completing its natural temperature drop, so you spend more time in lighter, less restorative sleep stages. In practice, that shows up as sweating, kicking off the covers, waking up more often overnight, and feeling less rested even after a full eight hours.

It also tends to compound: once you're too warm to sleep well, disrupted sleep makes it harder for your body to regulate its temperature the next night. If you consistently run hot regardless of the thermostat, the fabric closest to you matters as much as the room.

Look for machine-washable, water-resistant covers; several sofa beds in Koala's sofa bed collection are built with exactly that in mind, so overnight sweat is a wipe or a wash away instead of a lingering problem.

What Happens When the Room Is Too Cold

A too-cold room causes a different kind of disruption: you wake up reaching for blankets, curling up to conserve heat, or getting up to adjust the thermostat. It's worth separating a cold room from cold feet. Cold feet alone can delay sleep onset even in a well-tempered room, and it's usually solved with socks rather than turning up the heat for the whole house.

If you're hosting a guest through a cold snap, having a spare blanket within reach helps more than the thermostat does; a few models in Koala's sofa bed range include built-in hidden storage for exactly this.

How to Hit the Right Sleep Temperature Without Running the AC All Night

You don't need to cool the whole house overnight to hit the right bedroom temperature. You need to cool the right things at the right time. A few changes do most of the work:

• Schedule your thermostat to drop a few degrees an hour before bed instead of running one constant temperature all night. This matches your body's own temperature drop instead of fighting it the whole time.

• Take a warm shower or bath 1 to 2 hours before bed. It sounds backward, but warming your skin temporarily makes your core temperature drop faster afterward, which helps you fall asleep quicker.

• Improve airflow before you touch the thermostat. A fan, a cracked window, or simply not blocking a vent can bring a room down several degrees without any extra cooling cost.

• Swap your bedding with the seasons. A heavier comforter in winter and lighter, breathable sheets in summer let you keep the room temperature more stable year-round instead of chasing the thermostat. Machine-washable covers make that seasonal swap easier since you can wash and rotate them rather than replacing bedding outright; the Koala Sofa Bed [4th Gen] and the Byron Sofa Bed [3rd Gen] both use Lifeproof covers built for this.

Bedding & Covers That Hold or Shed Heat

The fabric closest to your skin affects how warm you feel as much as the room's actual temperature does. Breathable, moisture-wicking materials shed heat; dense or synthetic materials trap it.

Cover care also differs across Koala's own sofa bed range, so it's worth checking before you buy. The Koala Sofa Bed [4th Gen] and the Byron Sofa Bed [3rd Gen] both use Lifeproof covers that are machine washable and water resistant. The Wanda Sofa Bed and the OG Sofa Bed are spot-clean only, so factor that in if a machine-washable cover matters more to you than size or price. If you want to go deeper on fabric choice for a shared or multi-use space, our guide to choosing sofa bed fabrics covers it in more detail.

Sleep Temperature in a Living Room or on a Sofa Bed

A living room runs warmer than a bedroom, even at the same thermostat setting. It usually has more windows, catches more afternoon sun, doesn't have a door to close off airflow from the rest of the house, and sees more daytime foot traffic that keeps the air moving and the temperature less stable.

For a guest sleeping on a sofa bed, that means the "ideal" bedroom number doesn't always translate directly. Aim for the cooler end of the adult range and pay closer attention to airflow than you would in a closed bedroom.

The right sofa bed for that room depends more on your space and your guests than on temperature alone:

Prices shown are current and reflect the base Classic fabric tier where applicable. Premium fabric options run higher on the Koala Sofa Bed [4th Gen] and the Byron Sofa Bed [3rd Gen].

If you're hosting more than one guest, our guide to the best sofa beds for two covers what else to look for beyond temperature comfort, and if back support matters as much as how warm or cool someone sleeps, the best sofa beds for bad backs is worth a read too.

Hosting overnight? If your guest room doubles as a living room, hitting the right sleep temperature is genuinely harder than it is behind a bedroom door: no closed door, more afternoon sun, and a guest who can't just crack a window from where they're lying. Shop Koala's sofa bed collection to compare the OG, Koala [4th Gen], Byron, and Wanda side by side and find the one that fits your space and your guests.

Frequently Asked Questions

Is 72 degrees too warm for sleep?

Yes, for most adults. 72°F sits several degrees above the 60°F to 67°F range that supports easy, uninterrupted sleep, so your body has to work harder to bring its core temperature down before you can drift off.

Is 75 degrees too hot to sleep?

Yes. At 75°F, you're well outside the ideal range, and that's the point where sweating, restlessness, and waking up overnight become common for most sleepers.

Is 65 degrees too cold to sleep?

No. 65°F is within the ideal range for most adults. If it feels cold, adjusting your bedding is usually a better fix than raising the thermostat.

What temperature do Japanese people sleep in?

There isn't one single answer, and it runs warmer than the Western consensus. Sleep researcher Kazuyo Tsuzuki has studied optimal sleeping environments in Japan for over 25 years, and her work points to a range of roughly 25°C to 28°C (77°F to 82°F) as close to ideal for inducing sleep, notably warmer than the 60°F to 67°F range commonly cited in US sleep guidance. Individual preference still varies widely, and this figure comes from a specific research context rather than a national standard.

What temperature should a guest sleeping on a sofa bed have?

Aim for the cooler end of the adult range, around 62°F, since living rooms tend to run warmer than closed bedrooms. Prioritizing airflow, such as a fan, an open window, or simply not blocking a vent, matters more in this kind of space than it does in a bedroom.