Adults age 18 and older generally need 7–9 hours of sleep a day, according to MedlinePlus guidance on healthy sleep. But adult sleep needs involve more than reaching a number. Your health, lifestyle, and sleep patterns also matter, along with whether your sleep is restful or frequently interrupted.
This guidance can help adults reviewing their sleep habits, including older adults and people whose work schedules make regular sleep difficult.
Understanding adult sleep needs
The 7–9-hour range is a general recommendation, not a single target that fits everyone. To consider whether you are getting enough quality sleep, MedlinePlus suggests asking yourself:
- Do I have trouble getting up in the morning?
- Do I have trouble focusing during the day?
- Do I doze off during the day?
A yes answer to any of these questions may mean your sleep habits need improvement. These questions are a starting point for reviewing your rest, not a diagnosis of a sleep disorder.
Do older adults need less sleep?
MedlinePlus says there is no evidence supporting the idea that adults need less sleep as they age. Older adults often get less sleep, spend less time in deep, restful sleep, and wake more easily. Those changes do not mean that their need for sleep has disappeared.
Why sleep quality matters
During sleep, the brain cycles through non-rapid eye movement, or non-REM, sleep and rapid eye movement, or REM, sleep. Non-REM sleep has three stages ranging from light to deep sleep. Most dreaming happens during REM sleep.
All stages are needed for healthy sleep. Frequent interruptions may keep someone from getting enough of certain stages, even if they spend enough time in bed.
Sleep supports learning, memory, tissue repair, immune function, and the balance of hormones involved in hunger and fullness. Too little sleep can make it harder to think clearly, react quickly, and form memories, increasing the risk of mistakes and accidents.
Insufficient or poor-quality sleep can also affect mood and increase the risk of health problems, including high blood pressure, heart disease, stroke, obesity, and type 2 diabetes.
Practical habits that support better sleep
Start by allowing enough time for sleep. MedlinePlus also recommends these habits:
- Keep a consistent schedule. Go to bed and wake up at the same time every day.
- Watch stimulants and alcohol. Avoid caffeine, especially in the afternoon and evening, avoid nicotine, and avoid alcoholic drinks before bed.
- Consider timing. Exercise regularly, but not too close to bedtime. Avoid large meals and drinks late at night, and do not nap after 3 p.m.
- Wind down. Try a bath, reading, or calm music before bed.
- Prepare your surroundings. Keep the bedroom cool, dark, and quiet, and remove distractions such as televisions, computers, and phones.
- Get daylight. Get enough sunlight exposure during the day.
If you cannot fall asleep for 20 minutes, MedlinePlus advises getting up and doing something relaxing.
What if you work shifts?
Shift work can make good sleep more challenging. MedlinePlus suggests taking naps and extending total sleep time, keeping lights bright at work, limiting shift changes, and restricting caffeine to the first part of the shift. For daytime sleep, reduce bedroom light and noise with measures such as light-blocking curtains or earplugs.
When to seek professional advice
See a health care provider if you have continued trouble sleeping. A sleep disorder, such as insomnia or sleep apnea, may be involved. Depending on the situation, a provider may suggest a sleep study or other treatments. General sleep-habit guidance cannot determine what is causing an individual’s ongoing sleep problems.
Frequently Asked Questions
Is seven hours enough sleep for an adult?
Seven hours falls within the general recommendation of 7–9 hours a day. Whether it is enough also depends on individual needs and sleep quality.
Why might I feel tired despite enough hours in bed?
Time in bed does not necessarily mean restful sleep. Frequent interruptions can prevent you from getting enough of certain sleep stages.
Can lack of sleep affect more than energy?
Yes. Insufficient sleep can affect concentration, memory, reaction time, and mood, and it is linked to increased risks of several physical health problems.
