Women Sleep Better and Hurt Less After Sauna, Men Report No Change, per 588-Person Swedish Study

Women who sauna regularly say they sleep better and hurt less afterward. Men in the same survey, who sauna more often, report no measurable change on either count. That is the central finding of a 588-person Swedish study published July 27 in the International Journal of Circumpolar Health, the second paper from a questionnaire that also produced a 384-woman study last December. Together they put numbers on why women go to the sauna and what they say it does for them, a question the authors note the field has mostly asked of men.

The July paper, “Sauna bathing: motivations, perceived benefits, and gender differences,” is by Åsa Engström of Luleå University of Technology, Karolina Wiell and Maria Lennkvist of Karlstad University, and Hans Hägglund of Uppsala University Hospital, the hematologist who holds the “sauna doctor” title at the Swedish Sauna Academy and wrote Bastuboken in 2020. Lennkvist, Hägglund and Engström wrote the December paper, “Women’s perceptions of sauna bathing and its impact on health and well-being.” Both are open access, the July paper reports no funding, and Sauna from Finland summarized the pair on August 21.

Why they go

The July paper’s other result comes from 443 written answers to the question of why people sauna. The authors sorted them into four themes and ranked them by share of responses. Women put mental recovery first. Men put company first.

Mental recovery, in the respondents’ words, meant meditation, silence, “cleaning the brain,” and time without a screen. It also meant the dark months: the paper records the sauna as a way to handle and endure the cold, dark time of year.

“I take a sauna to have time for myself since I work with people with distance from the labour market, it’s my way of relaxing after an intense workday. It’s like a kind of meditation.”Female participant 229, quoted in the July paper

“There is a certain tradition of using the wood-fired sauna when we are at the cottage. At home, we sauna to conclude the work week. It gives me and my wife a chance to talk about what has happened and provides us with a good start to the weekend.”Male participant 104, quoted in the July paper

The authors read the sex split through Sweden’s public health picture. Women in the sample rated their own mental health lower than men did (3.38 against 3.52 on the same 4-point scale, p = .025), and the paper notes that women in Sweden report more worry, anxiety and sleep problems and are overrepresented in sick leave for mental illness. For men, who the paper says keep fewer close contacts outside their partner relationships, the sauna is a place where it is socially acceptable to sit and talk, which the authors offer as the reason company ranks first.

The gap the Finnish cohorts left

The reason two survey papers get this much attention is the shape of the evidence before them. The Finnish KIHD cohort behind the 40% cut in all-cause mortality that every sauna sales deck quotes was 2,315 men, aged 42 to 60 at baseline, followed for a median of 20.7 years. When the same group extended the cohort to women in 2018, the 1,688-person sample was 51.4% female and the authors reported no statistically significant association with cardiovascular death in women, which they attributed largely to low event rates; their test of interaction found no evidence that men and women actually differ. So the outcome data on women is thin, not negative. The full male cohort record, paper by paper, is in our September piece on the men’s wellness market.

The Swedish papers do not fill that gap with outcomes. They fill it with experience: what women say the sauna does for them, and what ruins it, at a scale of a few hundred, where one of the women-only sauna studies the authors cite ran to nine participants. That is the useful part for anyone who runs a hot room.

What the studies do not show

Both papers are cross-sectional surveys of people who already sauna and already like it, recruited through two sauna groups on social media, a sauna association, and two university websites. The sleep and pain comparisons are retrospective self-ratings, not measurements, with no control group and no adjustment for confounders such as education, employment or exercise. The effect sizes the authors call medium correspond to average changes of 0.30 and 0.41 of a point on a 4-point scale. 88% of the women had a university or college education. Mental health was not rated before and after, so “mental recovery” is a motivation people wrote down, not a measured result. The questionnaire was written for this study and has not been validated elsewhere. The authors’ own line is that “the results should therefore be interpreted as changes rather than causal,” and they ask for prospective studies with wearable sleep sensors next.

A retailer who puts “better sleep” on a product page on the strength of this is quoting an opinion poll of enthusiasts, not a trial. “Regular bathers report sleeping better” is the honest label, and it is still a good one.

Where the findings land: the schedule

Half the women surveyed (51.2%) usually bathe in a community sauna rather than a private one, so this is the operator’s customer, not only the home bather. Read together, the two papers describe what that customer is buying and what makes her not come back.

Quiet is a product. The women’s top motive was mental recovery, and the December paper is specific about the conditions. Conversation worked when it was subdued and inclusive. Loud discussion, complaining, and people taking up too much space meant, in the authors’ words, “the harmonic calm did not materialise.” One respondent put it plainly: “I prefer a quiet sauna over chatting.” Put a quiet block on the schedule and name it as one. Enforce the phone rule at the door rather than with a sign nobody reads; screen-free time was among the benefits most often written into the open answers.

Löyly etiquette belongs on the wall. Respondents singled out being asked before someone put more water on the stones, as opposed to a stranger cranking the heat without checking. The December paper also records burns from steam, “dangerously high steam levels,” and reactions to substances added to the water, mint crystals among them. Post an etiquette card that says ask before you throw, have staff model it, and keep aromatics house-controlled. That is a policy change and a laminated sign, which is the cheapest fix in this article.

Mixed rooms are where some women opt out. The December paper reports women feeling uncomfortable when a sauna was crowded with strangers or when bathing with men they did not know, and describes men showing off naked bodies or sitting too close. The authors point out that mixed public saunas are relatively common in Sweden, largely because one shared room is cheaper to run than two, and suggest that women-only sessions “might provide a safer environment for those who prefer it.” Whether mixed rooms change how many women choose sauna at all is, in their words, a question for further research.

The US already has a working template. The Schvitz in Detroit, open to guests since 1930, runs women-only hours on Saturday from 7 to 11 a.m., Sunday from noon to 4 p.m., and Tuesday from noon to 10 p.m., men-only blocks on Sunday morning, Wednesday and Thursday, and co-ed hours the rest of the week. Bathing suits are required during co-ed hours and optional in the single-sex blocks, per the bathhouse’s posted schedule. An operator with one hot room does not need a second building to test this. Give one weekly block to women for a quarter, hold price constant, and count the tickets and the return visits.

Price to the cadence you actually have. In this sample women came weekly (35.9%) or less than weekly (28.9%); men came several times a week (52.7%). An unlimited monthly membership is priced for the men’s cadence. A weekly pass, or a punch card that does not expire, fits the women’s. That is an inference from a Swedish sample, so test it against your own visit logs before repricing.

Cold is half the routine. 48.2% of the women combine sauna with cold water, and the heat-cold cycle runs through their answers. One woman described it as “almost a meditative act to [be in the] sauna, bathe in the cold water, and then start again.” Operators who already sell plunge alongside sauna as one product are selling what this group says it wants. A sauna with no cold path is missing the second half of the product for half of these customers.

The bar is a liability the customers named. 19.3% of the women reported using alcohol in connection with sauna, and the negative experiences in the December paper include nausea, dizziness and fainting when the two were combined, plus women who fainted from heat alone, dehydration, or staying too long. If your license lets you serve near the hot room, the respondents have told you what the incident report will say.

Nature is a design spec. Respondents said a view of water, forest or mountains, and the sound of a wood fire, gave the session “something extra,” especially when there was open water to bathe in next to the sauna. In equipment terms that is a window placed at bench height facing something worth looking at, a wood-fired heater where code and staffing allow one, and a cold-water exit that is not a shower stall. None of that is new to Finnish designers. It is new as a stated preference from a few hundred women.