The bedroom
Why a warm room costs you deep sleep
Heat does more than make you uncomfortable. It trades your deepest sleep for time awake.
The journal
Better living starts with sleep.
Plain-English science on sleep, temperature, light, and the conditions that shape a night.
Latest
Body clock
Why mornings feel so heavy
The bedroom
Does stale bedroom air affect your sleep?
The bedroom
How noise affects sleep, even if you don't wake
The bedroom
What light does to you while you sleep
The bedroom
How humidity changes your sleep
The bedroom
Temperature, humidity, light, noise, and the air around your sleep.
The bedroom
Does stale bedroom air affect your sleep?
Eight hours in a closed room changes the air you breathe. A small study tested whether that matters.
The bedroom
How noise affects sleep, even if you don't wake
You might sleep through traffic. Research suggests your body may not.
The bedroom
What light does to you while you sleep
Your eyes are closed, but a bright room can still change your sleep. Here is what one study found.
Body clock
The daily rhythms that decide when you get sleepy and when you wake.
Body clock
Why mornings feel so heavy
That foggy feeling after waking has a name. Here is what makes it worse, and what may ease it.
Body clock
Circadian rhythms and sleep cycles
How circadian rhythms, sleep stages, and body temperature work together to shape the quality of a night.
Body clock
Why you wake up at 3 a.m.
Waking in the small hours is more normal than it feels. Here is what your body is doing at that point in the night.
Sleep science
What your body and brain are doing through the night.
Sleep science
What happens to your breathing while you sleep
Your breathing changes all night, and most of it is normal. Here is what is happening, and what is worth raising with a doctor.
Sleep science
Sleep is when your body recovers
How deep sleep drives physical repair, hormone release, immune function, and memory consolidation.