Sleep deprivation

A new study has revealed how the brain uses the night to flood the body with pulses of growth hormone to repair muscles, strengthen bones and balance metabolism. And why cutting corners on sleep undermines your physical health short- and long-term.

If you deal with waves of daytime drowsiness, you might be among the estimated 33% of the population suffering from excessive daytime sleepiness. In the largest study of its kind, scientists have uncovered the condition's unique biological fingerprint.

In 2025, around 24 million Americans are estimated to suffer from sleep apnea, and around 90% of these cases are undiagnosed. Now, a groundbreaking new study warns that the prevalence of this serious condition will soar as the planet warms.

Whether it's reading a book or putting on music, many of us have some kind of ritual – small or large – that we do to "wind down" in bed. But it can be hard to gauge how good or bad these activities are. Now for one popular pastime, we know more.

Skipping one night of sleep causes healthy adults to see a spike in immune cells linked to chronic inflammation, a key feature of obesity, according to new research. It highlights the powerful link between sleep and immune health.