CDC — all stories

HEALTH

How much water a day the evidence actually supports

The familiar advice to drink eight glasses of water a day is not a scientific target but a rough guide, and the amount a person actually needs depends on their age, sex…

Whitehall Minute
A glass of iced water on a table, illustrating daily fluid intake guidance
HEALTH

How long a nap should really last

Naps of more than an hour have been linked to faster cognitive decline and disrupted night-time sleep, although much of the evidence is observational.

Whitehall Minute
A person taking a lunch-hour nap in a park, illustrating how long an effective nap should last
HEALTH

Six things that help you sleep

The Sleep Foundation says it is best to talk to a doctor about sleeping problems that are severe or long-lasting, or about sleepiness that lasts through the day.

Whitehall Minute
A made bed in a bedroom, with daylight coming through an open patio door