Functionality Alone Isn't Enough for Ideal Sleep!? 'Beautiful and Comfortable Wear' Transforms QOL and Next-Day Performance

String Inc. (headquartered in Amagasaki City, Hyogo Prefecture; CEO: Makoto Matsubara) conducted a survey targeting men and women aged 20 to 50 who either (1) are interested in or (2) have no particular interest in self-investment in beauty, health, and lifestyle, regarding 'sleep-related stress and loungewear during the rainy season and early summer'.

During the transition from the rainy season to early summer, increasing temperatures and humidity cause more people to experience discomfort while sleeping.

This discomfort may not only stem from room temperature, but could also be hidden in the 'loungewear or nightwear' they compromise on wearing.

In addition to physical discomfort such as clothing moisture buildup, worn-out clothes that don't match the bedroom's aesthetic can act as 'visual noise', hindering the brain's ability to relax.

So, how many people actually experience sleep-related stress during the rainy season to early summer?

And how does the harmony between pre-sleep clothing and the surrounding space affect falling asleep?

To address these questions, String Inc., the company selling conditioning wear 'NUOLS' (https://nuols-conditioning-wear.web.app/), conducted a survey targeting men and women aged 20 to 50 who either (1) are interested in or (2) have no particular interest in self-investment in beauty, health, and lifestyle.

Survey Overview: 'Survey on Sleep-Related Stress and Loungewear During the Rainy Season and Early Summer'

[Survey Period] May 26 (Tue) – May 27 (Wed), 2026

[Survey Method] Internet survey conducted via PRIZMA (https://www.prizma-link.com/press)

[Number of Respondents] 1,016 people (504 in group ①, 512 in group ②)

[Survey Target] Monitors aged 20–50 who, at the time of the survey, stated they were either (1) interested in or (2) not particularly interested in self-investment in beauty, health, and lifestyle

[Survey Conducted by] String Inc. (https://ap-string.com/)

[Monitor Provider] Sacrisa

Is room temperature the only cause of sleep discomfort? Nearly half feel 'sticky skin from night sweats' as another major sleep disruptor

First, respondents were asked: 'During the period around June, from the rainy season into early summer, does your stress related to difficulty falling asleep or waking up during the night increase?'

Approximately 70% of those interested in self-investment in beauty, health, and lifestyle answered 'increases significantly' or 'increases somewhat', indicating greater sensitivity to changes in sleep environment during seasonal transitions compared to those with no particular interest.

Next, among those who answered 'increases significantly' or 'increases somewhat', we asked: 'On average, how long does it take you to fall asleep after getting into bed during the rainy season to early summer?'

The results showed that for both groups—those interested and those not interested in self-investment—over 30% each reported taking '10 to under 30 minutes' or '30 minutes to under 1 hour' to fall asleep, showing a similar trend.

Even those who actively invest in self-care face challenges in falling asleep. So, what specific discomforts are preventing them from sleeping?

When asked about 'physical discomforts or bodily factors that disrupt sleep during the rainy season to early summer', the most common response was 'the bedroom is too hot (60.0%)', followed by 'sticky skin from night sweats (52.4%)' and 'clothes clinging to the body (26.0%)'.

Beyond environmental factors like temperature and humidity, discomfort from night sweats and clothing in direct contact with the skin ranked highly.

This suggests that improving sleep quality requires not only room temperature control via air conditioning but also the selection of clothing with excellent moisture absorption and breathability.

Worn-out clothes make 'post-bath comfort short-lived'—what other stresses or dissatisfactions exist?

How does clothing choice before bed affect mental well-being?

All respondents were again asked: 'When wearing compromised clothing like old T-shirts during pre-bed relaxation time, what kinds of stress or dissatisfaction do you tend to feel?'

The issue of 'post-bath comfort not lasting'—a functional dissatisfaction—was shared by about 30% of respondents, regardless of their interest in self-investment.

However, among those interested in self-investment, the proportion reporting psychological and visual stress—such as 'difficulty switching into relaxation mode' or 'feeling down about my appearance'—was significantly higher than among those with no particular interest.

How effective is changing into beautiful, high-design wear perceived to be in transitioning into nighttime rest mode?

Among those interested in self-investment in beauty, health, and lifestyle, we asked: 'Do you think changing into beautiful, high-design wear that lifts your mood after returning home or before bedtime is an effective way to switch from daytime work mode to nighttime rest mode?'

80% answered 'very effective (23.4%)' or 'somewhat effective (56.6%)'.

The high rate of 'effective' responses suggests that the act of changing into mood-enhancing, beautiful wear after returning home or before bedtime is widely recognized as a process that eases daytime tension and guides the mind and body into rest mode.

About 80% say 'harmony between clothing and space' is important for high-quality relaxation

Does harmony with the room environment matter, beyond just the clothing's design?

We continued by asking those interested in self-investment:

'Do you think it's important for the design of your loungewear or nightwear to harmonize with the interior and atmosphere of your bedroom or living room to help transition your mind and body into relaxation mode?'

Approximately 80% answered 'very important (19.6%)' or 'somewhat important (58.3%)'.

The high emphasis on interior harmony indicates that the balance between 'what you wear' and 'the space you inhabit' is closely linked to transitioning into a relaxed state.

Visual harmony between one's clothing and room interior eliminates discomfort and creates a deeper sense of relaxation.

While harmony with the space is desired, what dissatisfaction exists with currently available functional pajamas for the rainy season and summer?