The house has fallen silent, the bedside lamp casts its soft glow, and you finally slip under the covers. Everything invites you to rest… except your feet. Ice-cold, almost as if they weren’t part of the rest of your body, they keep you awake. You rub them together, curl up, and wait for the warmth to return. And the minutes tick by.
Having cold feet at night is one of the most common complaints as soon as fall sets in. It’s not just a matter of comfort: the temperature of our feet plays a real role in falling asleep. In this article, we explain why feet get cold, what the science says, and how to keep them warm easily with a few simple steps and the right bedding.
Why do our feet get cold at night?
When it’s cold, our body makes a choice: to prioritize protecting vital organs. To retain heat in the body’s core, it constricts the blood vessels in the extremities. This is called vasoconstriction. As a result, the feet receive less blood—and therefore less heat. Because they are far from the heart, have little muscle mass, and are in direct contact with cold surfaces, they are often the first to feel the cold and remain colder than the rest of the body.
This phenomenon is more pronounced at night. To fall asleep, our bodies naturally lower their core temperature—a mechanism we explain in detail in our article “Why Your Body Cools Down During Sleep.” Added to this are inactivity, which slows blood circulation, and sometimes stress: according to e-santé, the adrenaline released during a spike in anxiety causes a reaction similar to that of cold on the small blood vessels in the extremities.
Warm Feet to Fall Asleep Faster: What the Science Says
One might think that cold feet are just a nuisance. In reality, they can delay sleep. In 1999, a team of researchers in chronobiology and sleep published a study in the journal *Nature* with the explicit title: “Warm feet promote the rapid onset of sleep.” In the study, the researchers showed that the degree of dilation of the blood vessels in the skin of the hands and feet is the best physiological indicator of rapid onset of sleep.
The paradox is only apparent: well-circulated, warm feet allow heat to escape more easily, which helps the body’s core cool down and makes it easier to fall asleep. Cold feet, on the other hand, indicate slowed blood circulation and constricted blood vessels: heat remains “trapped,” and falling asleep takes longer.
A more recent study, published in 2018 in the Journal of Physiological Anthropology, tested the effect of wearing socks to bed in a cool room. Among participants who wore them, it took an average of 7.5 minutes less to fall asleep, sleep lasted 32 minutes longer, and there were significantly fewer awakenings. An important caveat: the study involved only six young men. Its results are encouraging but need to be confirmed on a larger scale.
What causes cold feet?
Everyday Causes
In the vast majority of cases, having cold feet in the evening is nothing to worry about. A few factors often come up:
- A room that's too cool, or a cold floor that you walk on barefoot before going to bed.
- A sedentary lifestyle: A day spent sitting slows down blood circulation in the legs and feet.
- Clothing or socks that are too tight and constrict the blood vessels.
- Tobacco: Nicotine acts as a powerful vasoconstrictor.
- Excessive caffeine intake in sensitive individuals.
- Stress, for the reasons mentioned above.
Possible medical causes
Sometimes, feet that are constantly cold—even when you're warm—can be a sign of an underlying condition. The most commonly cited causes are:
- Raynaud's phenomenon is a circulatory disorder that causes spasms in small blood vessels and makes the fingers or toes turn white when exposed to cold. It particularly affects women.
- An iron or vitamin B12 deficiency: Anemia reduces oxygen supply to the tissues.
- Hypothyroidism, which slows down metabolism and heat production.
- Diabetes, which can eventually damage the nerves and blood vessels in the extremities.
These conditions cannot be diagnosed on your own: if you continue to feel cold despite following the advice below, or if this sensation is accompanied by other symptoms, talk to a doctor (we’ll come back to this at the end of the article).
How can you warm your feet in bed?
Good news: when your feet are cold, a few simple steps are often all it takes to warm them up and help you fall asleep more peacefully.
- A warm foot bath before bedtime—about ten minutes in pleasantly warm water, followed by thorough drying. It warms the feet and dilates the blood vessels.
- A foot massage, using vegetable oil or cream, to stimulate circulation. Just a few minutes is all it takes, and it’s a nice little moment just for yourself.
- Place a hot water bottle at the foot of the bed a few minutes before going to sleep. Fill it with hot—but not boiling—water, never place it directly against your skin, and remove it before you fall asleep.
- A few exercises: roll your ankles, wiggle your toes, stand on your tiptoes. These simple movements help restore blood flow to your extremities.
- Warm slippers in the evening, rather than walking barefoot on a cold tile floor.
Sleeping with socks on: Is it a good or bad idea?
This is often the first solution that comes to mind, and it has both supporters and critics. Based on the studies cited above, wearing socks at night can actually help you fall asleep when your feet are cold. It all depends on how you do it.
Choose loose-fitting socks that don’t constrict the ankle, so as not to restrict blood flow. As for material, wool socks retain heat well while allowing the skin to breathe; cotton socks are lighter, ideal for cool but not freezing nights. Avoid synthetic fibers, however, as they trap moisture: sweaty feet get cold quickly. Finally, choose a clean pair that you use only at night. If you get too hot during the night, don’t hesitate to take them off—the goal is to help your body, not to overheat it.
Bedding that keeps your feet warm
Cold feet are often caused by the bed itself, since that’s the area that’s least well covered: the comforter slips, lifts up, and lets air through. Your bedding can make a real difference.
A comforter suited to the season. In winter, a comforter that’s too light will quickly let your extremities get cold. Our down and feather comforter, with a warmth rating of 4.5/5, envelops the body in gentle warmth thanks to its filling of recycled down and feather clusters. If you prefer a versatile option, the 4-season comforter combines two comforters that are joined together with simple strings to achieve the same 4.5/5 warmth rating in the middle of winter. To make the right choice, check out our guide to choosing the right winter comforter. Also, be sure to tuck it in tightly at the foot of the bed—that’s often where heat escapes.
A folded throw at the foot of the bed. This is the simplest and most effective trick: an extra layer placed only at the foot of the bed, without weighing down the rest of the bed. Wool throws are particularly well-suited for this, such as our GOYA merino wool throw or our ILLY alpaca wool throw—both made from Woolmark-certified wool and known for their temperature-regulating properties. To learn more about this material, read about the benefits of wool in bedding or check out our guide to choosing a wool throw.
A cool bedroom, but not cold. It might be tempting to turn up the heat, but a room that’s too warm disrupts sleep and can cause night sweats. It’s best to keep the room at around 16 to 18 °C (see what the ideal bedroom temperature is) and use bedding that provides warmth where you need it. Our tips for setting your heating properly at night can also help you.
And if you're sleeping as a couple and one of you is always cold while the other is too hot, two comforters with different warmth ratings can keep everyone happy. We discuss this in " Separate Comforters or the Burrito Technique?"
Evening Routines to Prevent Cold Feet
Preventing cold feet also means preparing your body throughout the evening:
- Get some exercise during the day: a walk, climbing a few flights of stairs, or some stretching. Good blood circulation during the day means less cold feet in the evening.
- Choose a hot, caffeine-free beverage, such as herbal tea, rather than coffee or strong tea at the end of the day.
- Avoid alcohol in the evening: it creates a misleading feeling of warmth and reduces the quality of your sleep.
- Incorporate a foot bath or massage into your routine, just like evening rituals that actually improve sleep.
- Get the bed ready before you get in: put a hot water bottle at the bottom for a few minutes, place a blanket at the foot of the bed, and keep socks within reach.
When should you see a doctor for cold feet?
It's perfectly normal to have cold feet from time to time, especially during the colder months. However, there are certain signs that should prompt you to see a healthcare professional:
- the toes turn white and then blue;
- Painful redness appears when the feet get warm;
- numbness or tingling persists;
- small sores appear on the feet;
- Your feet are constantly cold despite these measures, even when the weather is mild.
The doctor can determine a specific cause—such as Raynaud's phenomenon, a deficiency, or a thyroid disorder—through a clinical examination and, if necessary, a blood test.
Key Takeaways
- Feet get cold at night because the body protects its vital organs and constricts the blood vessels in the extremities.
- Warm feet help you fall asleep faster: that's what a study published in *Nature* in 1999 shows.
- A foot bath, massage, hot water bottle, and simple movements can help improve circulation before bedtime.
- Sleeping with socks on can help, as long as they are loose-fitting and made of natural materials (wool or cotton).
- A warm, snugly tucked-in comforter and a wool throw at the foot of the bed keep your feet warm without overheating the room.
- If your feet are constantly cold, change color, or feel numb, you should seek medical advice.
Kipli, of course.
Written by the Kipli team, specialists in natural sleep since 2018. This article is based on studies published in *Nature* (1999) and the *Journal of Physiological Anthropology* (2018), as well as on medical sources intended for the general public. It is not a substitute for the advice of a healthcare professional.