Sleep
6 min read · Reviewed June 2026
Sleep is far from passive — it is when the body does much of its repair work. The CDC advises that most adults need 7 or more hours of good-quality sleep a night, yet (as Harvard Health notes, citing the CDC) more than a third of U.S. adults regularly fall short. The good news: many sleep problems respond to changes in daily habits, often called sleep hygiene.
Why sleep matters
During sleep, the CDC explains, the body repairs tissue, supports the immune system, and consolidates memories that are essential for learning. Getting enough sleep improves mood, attention, and decision-making.
Consistently missing sleep does the opposite. The CDC links insufficient sleep to higher risk of type 2 diabetes, heart disease, and high blood pressure, as well as poorer mental health.
Sleep hygiene basics
The CDC's core recommendations are straightforward: go to bed and wake up at the same times every day, including weekends; keep your bedroom quiet, dark, relaxing, and cool; and remove or switch off electronic devices well before bed.
It also helps to avoid large meals and caffeine close to bedtime — caffeine in the afternoon or evening can delay sleep. Daytime physical activity and morning light both strengthen the body clock that governs your sleep-wake cycle.
When to seek help
If you regularly struggle to fall or stay asleep despite good habits, the CDC suggests talking with a healthcare provider — it could be a treatable sleep disorder. Keeping a short sleep diary can help your provider understand the pattern.
Key points
- Most adults need 7+ hours of quality sleep; more than a third of U.S. adults don't get enough (CDC).
- Sleep supports tissue repair, immunity, memory, mood, and heart health.
- Keep consistent bed/wake times and a cool, dark, quiet, device-free bedroom.
- Limit caffeine near bedtime; daytime exercise and morning light help.
When to seek help
If sleep problems persist despite good sleep habits, talk with a healthcare provider — it may be a treatable sleep disorder.
Sources
Further reading
Draft content, pending clinical review.