Guides
Guides are collected here as they appear, newest first.
What is here so far?
The full list, latest entry first: 12 guides in all.
Each guide states its sources in the sentence that uses them, and any count it makes says how many documents were read and on what date.
Dust mites need 70% humidity, so what does that mean for your bedroom?
The 70% figure comes from lab studies of how house dust mites keep water in their bodies. People often repeat it as if mites switch on at 70% and off below it. The research describ
How do you read a VOC reading, and what does a new mattress emit?
A home VOC monitor gives you one number for a mix of many gases, and the low-cost sensors in most units cannot turn that mix into a true concentration. Lab work fills in the other
How do you ventilate a bedroom in winter without losing the heat?
On a cold night a closed bedroom stays warm by giving up its fresh air. Two people breathing for eight hours in a small sealed room can push carbon dioxide well past the level that
What happens to bedroom air temperature between midnight and 5am?
In the dark hours before dawn, three things pull on the air in a bedroom at once. The outdoor air keeps cooling toward its dawn low. The heating or cooling system follows its sched
Why isn't the coldest hour of the night the middle of it?
Ask people when the night is coldest and most will point to the dead middle of it, but the weather says otherwise. On a clear, calm night the air keeps cooling past first light. We
Which blackout shades keep a bedroom dark at night?
A blackout shade should keep a bedroom dark whether the light outside comes from a streetlamp, a neighbor's porch light or an early summer sunrise. Most blackout fabrics stop nearl
Does your body temperature rise when you sleep?
At night two parts of the body move in opposite directions, so this question gets two different answers online. The core cools from the evening on, while the hands and feet warm by
What is the ideal humidity for a bedroom?
Relative humidity compares the water vapor in the air with the most that air could hold at its current temperature. It is the number a hygrometer shows. For a bedroom, the EPA says
How cold should your bedroom be when you sleep?
Ask a sleep clinic how cold a bedroom should be and the answer lands in the 60s. Cleveland Clinic's sleep psychologist advises 60 to 67°F (Cleveland Clinic, 2021), and the Sleep Fo
What temperature should a bedroom be for sleep?
The body sheds heat at the moment of falling asleep, so the thermostat matters more at night than most people expect. This page collects what hospitals, health services and sleep r
How do you choose blackout curtains for a bedroom that stay dark?
A bedroom that glows before dawn has a hardware problem rather than a willpower problem, and the remedy is mostly geometry. Blackout is a claim about cloth, and a room is not a swa
Does white noise help you sleep, and how should you set it up?
Most people reach for white noise because of something outside the bedroom: a bus route, a shared wall, a partner on a different schedule. The research answers a narrower question