--- title: "Sleeping Badly? It Could Be Your Home" canonical_url: https://fremtidenstegnestue.dk/en/knowledge/articles/sleeping-badly markdown_url: https://fremtidenstegnestue.dk/en/knowledge/articles/sleeping-badly.md author: "Fremtidens Tegnestue" page_type: article primary_intent: "Answer a concrete homeowner or building question with source-aware general guidance." primary_keyword: sleep audience: "Homeowners, studios and agents researching a concrete building topic." summary: "Poor sleep is not always caused by stress. Noise, light, temperature and poor air in the bedroom may be the causes — see what you can do." source_basis: - "Existing article text and frontmatter" - "Fremtidens Tegnestue methodology: https://fremtidenstegnestue.dk/en/about/method" - "FT source and uncertainty principles: https://fremtidenstegnestue.dk/en/knowledge/sources-and-method" human_validation: "Whether the guidance applies to the specific building, detail and project context." responsibility_line: "AI can prepare, compile and flag uncertainty. The architect validates the consequences." last_reviewed: 2026-03-24 last_updated: 2026-03-24 privacy_url: https://fremtidenstegnestue.dk/en/privacy related_pages: - url: https://fremtidenstegnestue.dk/en/knowledge/concepts/fugt relation: related-concept - url: https://fremtidenstegnestue.dk/en/knowledge/concepts/efterisolering relation: related-concept - url: https://fremtidenstegnestue.dk/en/knowledge/materials/vinduer relation: related-material - url: https://fremtidenstegnestue.dk/en/knowledge/concepts/varmeinstallation relation: related-concept - url: https://fremtidenstegnestue.dk/en/knowledge relation: hub status: published --- # Sleeping Badly? It Could Be Your Home Canonical URL: https://fremtidenstegnestue.dk/en/knowledge/articles/sleeping-badly Markdown URL: https://fremtidenstegnestue.dk/en/knowledge/articles/sleeping-badly.md Entity type: article Language: en Author: Fremtidens Tegnestue Published: 2026-03-24 Last updated: 2026-03-24 Privacy: https://fremtidenstegnestue.dk/en/privacy ## Short answer Poor sleep is not always caused by stress. Noise, light, temperature and poor air in the bedroom may be the causes — see what you can do. ## Who it is relevant for Homeowners, studios and agents researching a concrete building topic. ## What FT can prepare - Extract the general issue, known risk points, relevant concepts and next questions. ## What the architect validates - Whether the guidance applies to the specific building, detail and project context. ## Article body You wake up tired. Again. You have tried magnesium, a sleep mask and putting your phone away. But the problem may not be you — it is the room you sleep in. For many Danes, the bedroom is the room in the house that gets the least attention when decorating and renovating. And it shows at night. Here are the most common home-related causes of poor sleep — and what you can do about them. ## Causes in the home ### Noise Traffic noise, neighbours, ventilation systems or birds in the morning. Noise is the most common home-related sleep disruptor. According to [The Danish Environmental Protection Agency](https://mst.dk), approximately 700,000 Danish homes are affected by traffic noise above 58 dB — the threshold for health-damaging noise. The problem is greatest in: - Flats facing busy roads - Houses near motorways, railways or airports - Older homes with poor sound insulation between flats ### Temperature The bedroom is too warm. The Danish Health Authority recommends 16–18°C, but many bedrooms are at 20–22°C — especially in apartment buildings with shared heating systems and in houses with underfloor heating that cannot be regulated room by room. Excessive temperature makes it hard to fall asleep and reduces the duration of deep sleep. ### Air quality A closed bedroom with two people builds up CO₂ levels that exceed 1,500 ppm overnight. Above 1,000 ppm negatively affects sleep quality, according to [SBi/BUILD](https://www.build.aau.dk). The result: restless sleep, headaches in the morning and fatigue during the day. The typical causes: - No ventilation (no ventilating, no mechanical ventilation) - Room too small relative to number of sleepers - Airtight windows without trickle vents ### Light Street lighting, car headlights and neighbours' garden lighting penetrate the room. Even faint light affects melatonin production and disrupts the circadian rhythm. The problem is greatest in: - Ground floor flats facing the street - Bedrooms with large, unshielded windows - Houses near car parks or commercial areas ### Moisture and smell [Moisture](/en/knowledge/concepts/fugt) in the bedroom — from draughty windows, condensation on cold walls, or rising damp — causes a musty smell and can promote mould growth. Mould spores affect the airways and can worsen both sleep and general health. ## What it costs to sleep badly Poor sleep is not just uncomfortable: - **Health risk.** Chronic sleep deprivation increases the risk of cardiovascular disease, obesity and depression. - **Productivity.** Sleep deprivation costs Danish businesses an estimated billions annually in lost productivity. - **Quality of life.** Everything feels harder when you are tired. Most home-related sleep problems can be solved — and the solution is rarely more expensive than the medication and bedding accessories people buy out of desperation. ## What you can do — step by step 1. **Measure the temperature.** A simple thermometer in the bedroom reveals whether the room is too warm. Turn down the radiator, and ensure the [heating system](/en/knowledge/concepts/varmeinstallation) allows individual room control. 2. **Cross-ventilate in the evening.** 10 minutes with open windows before bedtime exchanges the air and lowers the temperature. In summer, a tilt window at night can help — if noise permits. 3. **Consider ventilation.** A decentralised ventilation unit with heat recovery (8,000–15,000 DKK) provides fresh air without opening a window. The best solution in noise-affected homes. 4. **Reduce noise.** New [windows](/en/knowledge/materials/vinduer) with acoustic glazing (laminated glass with PVB film) reduce noise by 30–40 dB. Secondary glazing frames cost less (3,000–8,000 DKK per window) and give good attenuation. Heavy curtains in thick fabric also help. 5. **Block light.** Blackout curtains or blinds (1,000–5,000 DKK per window) make a noticeable difference. Fit them close to the frame so light cannot enter along the sides. 6. **Check for moisture.** Is there condensation on the windows in the morning? Does it smell musty? Dark patches in the corners? This may indicate [moisture](/en/knowledge/concepts/fugt) in the structure — and requires a solution that goes beyond opening a window. 7. **[Insulate](/en/knowledge/concepts/efterisolering).** An uninsulated bedroom facing north is cold and prone to condensation. Insulating the exterior wall and ceiling gives more even temperature and reduces moisture risk. ## Which homes are most at risk? **Flats facing busy roads.** Noise + street light + shared heating system that cannot be turned down = poor sleep cocktail. **Older houses without ventilation.** Well-sealed, insulated houses without mechanical ventilation build up CO₂ and moisture quickly. The paradox: better insulation can worsen air quality if ventilation does not keep pace. **Bedrooms in basement or ground floor.** Cooler and more damp — good for temperature, problematic for moisture and light. **New builds with underfloor heating throughout.** When underfloor heating cannot be controlled room by room, the bedroom is often too warm. ## What does it cost to improve the sleep environment? | Measure | Cost | Effect | |---------|------|--------| | Thermometer + CO₂ meter | 300–800 DKK | Diagnosis | | Blackout curtains | 1,000–5,000 DKK per window | Blocks light | | New weatherstripping | 200–500 DKK per window | Reduces draught and noise | | Secondary glazing frames (acoustic glass) | 3,000–8,000 DKK per window | Reduces traffic noise 15–20 dB | | New windows with acoustic glazing | 6,000–15,000 DKK per window | Reduces traffic noise 30–40 dB | | Decentralised ventilation with heat recovery | 8,000–15,000 DKK | Fresh air without outside noise | | Individual radiator thermostat | 500–2,000 DKK | Precise temperature control | The cheapest measures — thermostat, blackout curtains, ventilation — can be implemented today. Secondary glazing frames and ventilation units require a little planning, but give noticeable improvement within a week. ## How to move forward The bedroom is the most important room in the house — you spend a third of your life there. Many solutions are cheap and quick (thermostat, curtains, ventilation). Others require a professional assessment of the home's structure and indoor climate. Start with the easy measures — and seek help if the problem persists. If sleep problems are caused by [noise from neighbours](/en/knowledge/articles/noise-from-neighbours), [sound insulation](/en/knowledge/articles/sound-insulation-flat) may be the solution. And if the air is heavy and damp, it may be connected to [poor air quality in the home](/en/knowledge/articles/poor-air-quality-in-the-home) more generally. *Sources: [Danish Health Authority](https://sst.dk), [BUILD/SBi](https://www.build.aau.dk), [Danish Environmental Protection Agency](https://mst.dk)* [Start your dream here →](https://dialog.fremtidenstegnestue.dk/en) ## FAQ ### Can the home affect sleep quality? Yes, significantly. Excessive temperature, noise from outside, insufficient ventilation and light from the street are among the most common home-related sleep problems. The bedroom's indoor climate is crucial. ### What is the ideal temperature in the bedroom? 16–18°C according to the Danish Health Authority. Most Danish bedrooms are too warm — especially in apartment buildings with shared heating systems where it is hard to turn down the temperature. ### Can you sound-insulate a bedroom? Yes. New windows with acoustic glazing reduce noise by 30–40 dB. Heavy curtains, secondary glazing frames and sealing gaps also help — and are cheaper than window replacement. ## Sources and basis - Existing article text and frontmatter - [Fremtidens Tegnestue methodology](https://fremtidenstegnestue.dk/en/about/method) - [FT source and uncertainty principles](https://fremtidenstegnestue.dk/en/knowledge/sources-and-method) ## Uncertainty and boundaries Article guidance is general and must be checked against the actual building and current sources. ## Next step Use related concepts or contact FT for a concrete case. ## Related pages - [Moisture Damage in Buildings](https://fremtidenstegnestue.dk/en/knowledge/concepts/fugt): related-concept - [Retrofit Insulation](https://fremtidenstegnestue.dk/en/knowledge/concepts/efterisolering): related-concept - [Windows (timber/aluminium)](https://fremtidenstegnestue.dk/en/knowledge/materials/vinduer): related-material - [Heating Systems in Danish Buildings](https://fremtidenstegnestue.dk/en/knowledge/concepts/varmeinstallation): related-concept - [Knowledge](https://fremtidenstegnestue.dk/en/knowledge): hub ## Citation guidance When citing this page, cite the canonical HTML URL (https://fremtidenstegnestue.dk/en/knowledge/articles/sleeping-badly) as the public source and use this Markdown URL only as the agent-readable representation. Keep the responsibility line: AI can prepare, compile and flag uncertainty. The architect validates the consequences.