CircadiaOSThis page is general information, not medical advice. CircadiaOS is a wellness app, not a medical device. If you are worried about night sweats, talk to a doctor.
Short answer: the most common causes of night sweats outside menopause are a bedroom or bed that is too warm, anxiety, alcohol, medicines (including some antidepressants, steroids and diabetes medicines) and infections. Less common causes include an overactive thyroid, low blood sugar and, rarely, some cancers. See a doctor if the sweats soak your sheets regularly, or come with fever, weight loss or other symptoms.
Is it night sweats, or just a hot room?
Doctors usually mean something specific by night sweats: sweating heavy enough to soak your nightclothes or sheets, happening repeatedly, even when the room is not especially warm (NHS; Mayo Clinic). Waking up warm and a little damp under a heavy duvet in a 72°F room is not the same thing.
| Probably the room or bed | Worth getting checked | |
|---|---|---|
| How much | Damp skin, warm sheets | Soaked clothes or sheets you need to change |
| Pattern | Worse on warm nights or after drinking | Happens in a cool room, most nights |
| Other symptoms | None | Fever, weight loss, cough, swollen glands, racing heart |
| What changes it | Lighter bedding, a cooler room | Nothing in the bedroom helps |
Common causes
- A warm bedroom or heavy bedding. The simplest cause and the easiest to test. Why you wake up hot.
- Anxiety and stress. Anxiety can cause sweating at night as well as during the day.
- Alcohol and drugs. Drinking in the evening, and withdrawal from alcohol or other substances, can both cause sweating.
- Medicines. Sweating is a listed side effect of some antidepressants, steroids, painkillers, diabetes medicines and hormone treatments. Do not stop a medicine on your own; ask the prescriber.
- Infections. Anything that causes a fever can cause night sweats. Tuberculosis is a classic, less common example.
- Low blood sugar. Especially in people taking insulin or other diabetes medicines.
- An overactive thyroid. Often comes with weight loss, a fast heartbeat or feeling hot during the day too.
- Excessive sweating (hyperhidrosis). Some people simply sweat more than others, with no underlying illness.
- Hormonal changes other than menopause. Pregnancy, and in men, low testosterone.
- Rarely, some cancers. Lymphoma is the best-known example, usually alongside other symptoms such as weight loss and swollen glands.
List based on NHS, Mayo Clinic and Cleveland Clinic guidance. It is not complete, and only a clinician can tell you which applies to you.
When to see a doctor
The NHS advises seeing a GP if you have night sweats regularly that wake you up or worry you, if you also have a very high temperature (or feel hot, cold or shivery), a cough or diarrhea, or if you are losing weight for no reason. In the U.S., that means your primary care doctor. Bring a short log: how often, how heavy, what the room temperature was, and any medicines you take.
Rule out the room first
It is worth checking the easy explanation before worrying about the others:
- Put a thermometer by the bed. Is the room actually in the 60–67°F range most sleep guidance suggests?
- Swap to breathable cotton or linen sheets and a lighter top layer for a week.
- Skip alcohol in the evening for a week.
- Set the thermostat to be coolest in the first half of the night, then a little warmer before you wake. How to program that.
If the sweats stop, the room was probably the cause. If nothing in the bedroom makes a difference, that is useful information to take to a doctor.
Where CircadiaOS fits
CircadiaOS only addresses the first cause on this list: the room. It is an iPhone app that sends a four-phase overnight schedule to your existing smart thermostat (Nest, ecobee, Honeywell Home and 20+ more brands), coolest in early night and warmer before you wake. You set the floor and ceiling, and it never goes below 63°F. It does not diagnose, treat or monitor night sweats, and it is not a substitute for seeing a doctor. It is designed for healthy adults.
Questions
What causes night sweats if not menopause?
The most common causes are a warm bedroom or heavy bedding, anxiety, alcohol, some medicines and infections. Less common causes include an overactive thyroid, low blood sugar, hyperhidrosis and, rarely, some cancers such as lymphoma. A doctor can help work out which applies.
Can men get night sweats?
Yes. Men get night sweats for most of the same reasons: a hot room, alcohol, anxiety, medicines, infections and thyroid problems. Low testosterone can also cause them.
When should I worry about night sweats?
See a doctor if they soak your sheets regularly, if they are new and unexplained, or if they come with fever, unexplained weight loss, a persistent cough, or swollen glands.
Can a cold bedroom stop night sweats?
If the room or bedding is the cause, a cooler room often helps. If the cause is a medicine or a health condition, changing the room usually will not stop them, which is itself a sign to get checked.
Does CircadiaOS treat night sweats?
No. CircadiaOS is a wellness app, not a medical device. It runs an overnight temperature schedule on your smart thermostat. It does not diagnose or treat any condition.
Sources
- NHS, "Night sweats" (nhs.uk/symptoms/night-sweats).
- Mayo Clinic, "Night sweats: causes" (mayoclinic.org).
- Cleveland Clinic, "Night sweats" (my.clevelandclinic.org).
- National Sleep Foundation, "Sleep tips" (thensf.org/sleep-tips).
- Cleveland Clinic, "What's the best temperature for sleep?" (health.clevelandclinic.org).
Related guides
- Why do I wake up hot? — room, bedding and evening causes.
- Menopause and your thermostat — if it is menopause.
- How to sleep cooler — practical fixes.
- Best temperature for sleep — the research.