The purpose of this study is to evaluate the multi-functional use of the domestic sleep environment (bedroom) and present evidence on outcomes that can be identified. By looking at the sleep environment in a broader context and considering the use of the bedroom space besides sleeping, this research responds to an information gap in sleep studies. A survey with multiple-choice questionnaire items was conducted with 304 participants in Australia to investigate the relationship between occupants’ use of the bedroom space and their sleep habits. We found evidence that today’s bedrooms are used for more than just sleeping, reflecting the respondents’ multi-functional needs. Of the respondents, 60% agreed to have a consistent sleeping routine, while 49% answered they have/might have a sleep problem. The mean hours spent in a sleeping environment are 9.31, while the sleeping mean hours are 7.12. While 40% reported using the bedroom as their living space, 61% said they prefer to use it only for sleep. Age, occupation and the bedroom’s location affect bedroom use and preferences. This study provides an initial inquiry into developing design strategies and understanding on the intertwined relationship between sleep and its environment.

This study investigates the current use of bedrooms to fill a knowledge gap in the existing sleep studies literature by focusing on user preferences and their needs. Despite substantial research into the optimal physical conditions for sleep, there remains a gap in understanding how individuals use their bedrooms today. As an initial step to bridge this gap, we employed a mixed-method research approach, integrating quantitative and qualitative data results. A survey including multiple-choice and open-ended questionnaire items was undertaken in Australia with 304 participants. Our research findings indicate that ‘having a separate bedroom in a house’ is the most common arrangement. However, other arrangements, such as living in a bedsit or sharing a bedroom, are indicators of diverse bedroom conditions. In total, 70% of respondents stated that they would like to make changes to their bedrooms for physical, functional, comfort-based, and aesthetic reasons, with comfort ranked as the highest. The majority of respondents stating they would not make any modifications in their bedrooms were found to be owner-occupiers. Mattress quality and privacy emerged as the most significant factors impacting the respondents’ bedroom experience, and female participants were reported to place higher importance on cleanliness compared to male participants. Additionally, preferences for sleeping alone or with a partner were found to shift with age. Based on our findings, we suggest that survey-based sleep studies should evaluate the bedroom arrangements before the individual’s sleep habits. Further studies are needed to understand how privacy needs influence sleep quality. From a built environment viewpoint, this study emphasizes the need to develop bedroom design solutions tailored to optimize bedroom conditions, particularly for rental tenants who often have limited control over the physical conditions of their sleep environment.

Objective: To compare the skeletal, dentoalveolar and buccal bone thickness of tooth–bone-borne (Hybrid-H) and tooth-borne (TB) maxillary expanders used for rapid maxillary expansion (RME) in early and late adolescents and for surgically-assisted RME (SARME) in young adults. Materials and methods: This two-centre clinical study included initial and 6 months post-retention CBCT records of 60 patients (27 males, 33 females; mean age 15.7 ± 3.75 years). The cohort was divided into two groups according to the expander type (H or TB) and subdivided into a further three groups determined by cervical vertebrae maturation stages: early adolescents (EA), late adolescents (LA), and young adults (A). EA and LA patients underwent RME and young adults received a SARME. Results: The hybrid-designed appliance increased the internal skeletal maxillary width and nasal width more than the TB-designed appliance anteriorly in EA and posteriorly in SARME young adults. The TB expanders tipped and expanded the first premolars more than the Hybrid SARME expanders in young adults and caused a greater reduction in buccal alveolar bone thickness at the level of the first premolars and molars at the three growth stages. Conclusion: The hybrid expanders, with relatively greater skeletal and nasal widening potential and fewer dentoalveolar side effects, were a favourable alternative to tooth-borne expanders for RME in the early and late adolescents, and for SARME in young adults.