Stress, Sleep and Energy in Women: The Complete Guide
The short answer: Stress, sleep and energy feed each other, and adults aged 18 to 60 need 7 or more hours of sleep a night.
- Women are about 41% more likely than men to have insomnia, based on a review of studies with 1,265,015 people.
- In women aged 40 to 59, 56.0% of those in perimenopause slept less than 7 hours a night.
- Tiredness that will not lift deserves a blood test: 27.4% of nonpregnant women aged 18 to 49 had iron deficiency in a recent national survey.
Last updated October 2026.
Stress, sleep and energy in women are tightly linked: stress can cost you sleep, and short sleep leaves less energy to handle stress. The CDC says adults aged 18 to 60 need 7 or more hours of sleep a night, yet more than one in three women aged 40 to 59 get less than that.
Below: what cortisol really does, why midlife sleep gets harder, which medical causes to rule out, and what has real evidence.
How are stress, sleep and energy in women connected?
They form a loop. Stress can keep you awake, poor sleep makes the next day feel harder, and low energy makes stress harder to manage. The National Institute of Mental Health notes that stress “may cause you to lose sleep” and that ongoing anxiety can lead to problems with sleeping.
The loop runs the other way too. The CDC lists “Reduce stress and improve your mood” among the benefits of getting enough sleep.
Women may feel this loop more often. A meta-analysis of 29 studies found women had a risk ratio of 1.41 for insomnia compared with men. The gap grew with age and was largest in older adults.
What is cortisol and what does it do?
Cortisol is a hormone made by your adrenal glands, two small glands on top of your kidneys. It helps your body respond to stress, which is why it is sometimes called the “stress hormone.”
Cortisol has everyday jobs, too. According to the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), it helps:
- maintain blood pressure
- regulate blood sugar
- reduce inflammation
- turn the food you eat into energy
A rise in cortisol during a stressful day is normal.
What are the signs of high cortisol in women?
Truly high cortisol over a long time is a medical condition called Cushing’s syndrome, and it is rare. The NIDDK estimates it affects about 40 to 70 people out of every million. It does affect about three times as many women as men, usually between ages 30 and 50.
People with very high cortisol for a long time tend to have clear signs. These include weight gain with thin arms and legs, a round face, a fatty hump between the shoulders, easy bruising, wide purple stretch marks and weak muscles. Steroid medicines similar to cortisol can also cause it.
Myth check. Social media posts often blame a “cortisol belly” or “adrenal fatigue” for everyday tiredness. A systematic review of 58 studies concluded that “adrenal fatigue is still a myth.” The NIDDK adds that fatigue and weight gain “can have many different causes.” If you are worried about cortisol, a doctor can order the right tests.
How much sleep do adults need?
Adults aged 18 to 60 need 7 or more hours of sleep a night. The CDC’s age table is below.
| Age | Recommended sleep per day (CDC) |
|---|---|
| 18 to 60 | 7 or more hours |
| 61 to 64 | 7 to 9 hours |
| 65 and older | 7 to 8 hours |
Hours are only half the story. The CDC says quality matters too. Signs of poor sleep quality include trouble falling asleep, waking up again and again during the night, and feeling tired even after enough hours in bed.
Many adults fall short. In CDC survey data, adults aged 45 to 64 had one of the highest rates of not getting enough sleep, at 39%.
Why do women sleep worse in perimenopause and menopause?
Sleep often gets shorter and lighter during the menopause transition. In a national survey of women aged 40 to 59, 56.0% of perimenopausal women slept less than 7 hours. That compared with 32.5% of premenopausal and 40.5% of postmenopausal women.
The same survey found that postmenopausal women had more trouble sleeping four or more times in the past week:
- Trouble falling asleep: 27.1%, compared with 16.8% of premenopausal women.
- Trouble staying asleep: 35.9%, compared with 23.7%.
- Not waking up well rested on 4 or more days: 55.1%, compared with 47.0%.
Night sweats are a big reason. The National Institute on Aging explains that hot flashes that happen at night are called night sweats. In the SWAN study of 1,449 women with frequent symptoms, hot flashes and night sweats lasted a median of 7.4 years. Hormone therapy is one option to discuss with your doctor. Our perimenopause and menopause guide covers the transition in more detail.
Which medical causes of fatigue should women check?
If you sleep enough and still feel drained, ask your doctor about iron and thyroid tests first. Both are common in women and both can cause fatigue.
Iron deficiency and anemia. In national survey data from 2015 to 2023, 27.4% of nonpregnant women aged 18 to 49 had iron deficiency, and 8% had iron-deficiency anemia. That is more than 1 in 4 women. The National Heart, Lung, and Blood Institute lists fatigue, dizziness, cold hands and feet and pale skin as symptoms. Heavy periods are a common cause. Once treatment starts, it often takes three to six months to restore iron levels.
Underactive thyroid. Nearly 5 out of 100 Americans aged 12 and older have hypothyroidism. Women are much more likely than men to develop it, and it is more common after age 60. Fatigue, weight gain, feeling cold and heavy or irregular periods are common signs.
Sleep disorders such as sleep apnea and restless legs syndrome are also worth raising if you snore, gasp or feel unrested.
What could be behind your tiredness? A quick guide
Use this table to start a talk with your doctor, not to diagnose yourself. Many signs overlap.
| Possible cause | Common signs | What to do |
|---|---|---|
| Short or poor sleep | Under 7 hours, waking often, tired after a full night | Keep a set bedtime and wake time; keep a sleep diary |
| Ongoing stress | Worry, tension, lost sleep, headaches | Regular exercise, a sleep routine, and help if it disrupts daily life |
| Night sweats in midlife | Waking hot or sweaty, broken sleep | Track symptoms; ask your doctor about treatment options |
| Iron deficiency or anemia | Fatigue, dizziness, cold hands and feet, pale skin, heavy periods | Ask for a blood test before taking iron |
| Underactive thyroid | Fatigue, weight gain, feeling cold, irregular periods | Ask for a thyroid blood test |
| Sleep disorder | Loud snoring, gasping, restless legs | Ask about a sleep study |
| Very high cortisol (rare) | Round face, purple stretch marks, fatty hump, weak muscles | See a doctor for proper testing |
Which daily habits improve sleep and energy?
Regular movement, a steady sleep schedule and careful timing of caffeine and alcohol have the best support.
Move most days. Adults need at least 150 minutes of moderate activity a week, such as 30 minutes a day, 5 days a week, plus 2 days of muscle-strengthening. A meta-analysis of 66 studies found regular exercise had moderate benefits for sleep quality.
Keep a steady schedule. The CDC advises going to bed and getting up at the same time every day. It also suggests a quiet, cool bedroom and turning off screens at least 30 minutes before bed.
Time your caffeine. The FDA cites 400 milligrams a day, about two to three 12-ounce cups of coffee, as generally safe for most adults. In a placebo-controlled study, 400 mg taken even 6 hours before bed still disrupted sleep.
Go easy on alcohol at night. The CDC defines moderate drinking for women as one drink or less in a day and advises avoiding alcohol before bedtime.
Do magnesium or ashwagandha help with sleep and stress?
Both have some research, but the trials are small and the evidence is weak. Neither is a substitute for treating a medical cause.
Magnesium. A review of 3 trials in 151 older adults found people on magnesium fell asleep about 17 minutes faster than on a placebo. Total sleep rose by about 16 minutes, which was not statistically significant. The authors rated the evidence low to very low quality. High doses from supplements can cause diarrhea; the NIH lists an upper limit of 350 mg a day from supplements for adults.
Ashwagandha. A review of 5 trials with 400 people found a small benefit for sleep, stronger at 600 mg a day or more for at least 8 weeks. A review of 12 trials with 1,002 people found lower stress scores, but rated the certainty of evidence as low. A newer review of 488 people found lower blood cortisol but no clear change in how stressed people felt.
Safety matters here. The National Center for Complementary and Integrative Health notes rare cases of liver injury. It says to avoid ashwagandha in pregnancy and while breastfeeding, and with thyroid or autoimmune conditions. It may interact with thyroid, blood pressure, diabetes and sedative medicines, so talk to your doctor first.
When should you see a doctor about stress, sleep or fatigue?
See a doctor if poor sleep or tiredness lasts for weeks, or if stress gets in the way of daily life. The NIMH suggests seeking help when stress symptoms interfere with your everyday life, cause you to avoid doing things, or seem to be always present.
The CDC advises talking to your provider if you regularly have problems sleeping. A sleep diary helps: note when you go to bed, wake up, nap, exercise, drink caffeine or alcohol and take medicines. Bring it to your visit.
Get care quickly for chest pain or shortness of breath, which can be signs of more serious anemia, or for very heavy periods. You can find more on these topics in our stress and energy coverage. Read how we check the research on our About page.
Frequently asked questions
Why am I always tired as a woman?
Common reasons include short or broken sleep, ongoing stress, night sweats in midlife, iron deficiency and an underactive thyroid. More than 1 in 4 nonpregnant women aged 18 to 49 have iron deficiency, so ask your doctor about a blood test if tiredness does not lift.
How many hours of sleep does a woman need?
The CDC recommends 7 or more hours a night for adults aged 18 to 60, 7 to 9 hours at ages 61 to 64, and 7 to 8 hours from age 65 on. These targets are the same for women and men.
Can stress cause high cortisol?
Cortisol rises during stress as a normal response. Truly high cortisol over a long time, called Cushing’s syndrome, is rare and usually has a medical cause such as a tumor or steroid medicines. A doctor can test for it.
Does magnesium help you sleep?
Possibly, but the evidence is weak. A review of 3 small trials in older adults found people fell asleep about 17 minutes faster on magnesium, with low-quality evidence. Talk to your doctor before starting a supplement.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
This article is for education and is not medical advice. Talk to your doctor before changing your diet, supplements, or medication.
Health Science Mag is an educational publication. Articles are for information only and are not medical advice. Talk to your clinician before changing your supplement routine.
