Quality Sleep: Why 7–9 Hours Matter and How to Sleep Better

Good sleep is free, and it is one of the most powerful health habits there is. At night your body does its maintenance: muscles recover, the brain sorts through the day, and hormones rebalance. When you wake up rested, everything else gets easier, from moving more and eating well to being patient with the people you love.

How much sleep do adults need?

Sleep needs change with age. Recommendations from the American Academy of Sleep Medicine (AASM) and the US National Sleep Foundation line up closely:

These are averages. Some people feel great after 7 hours; others need 9. Your best guide is how you feel: if you wake up without an alarm and don't fight drowsiness during the day, you are probably getting enough.

Quality matters too: waking often, sleeping lightly or waking before dawn and not drifting off again all cut into your rest.

What good sleep does for you

Sleep isn't wasted time; it works for your whole body:

• Heart and blood vessels. Enough sleep helps keep blood pressure in a healthy range. That's why the AHA added sleep to its list of core heart-health measures in 2022 (AHA, 2022).
• Blood sugar and weight. Ongoing short sleep is linked to weight gain, type 2 diabetes and high blood pressure. Well-rested people also tend to have steadier appetites.
• Memory and mood. During sleep the brain consolidates what you learned. People who sleep well focus better and feel calmer (NIA).
• Recovery. Muscles rebuild after exercise mostly at night, so sleep is exercise's natural partner.
• Safety. In older adults, good sleep means less daytime drowsiness and fewer nighttime falls (NIA).

8 steps to better sleep

1. Keep one schedule. Go to bed and get up at the same time every day, weekends too. Your body clock loves routine, and a steady schedule makes both falling asleep and waking up easier.
2. Get morning light. Spend some time outdoors or by a window soon after waking. Morning daylight sets your body clock so sleepiness arrives on time in the evening.
3. Keep caffeine to the morning. Coffee, strong black and green tea, and energy drinks all contain caffeine. Skip them after 2 p.m. and switch to water or a caffeine-free herbal tea in the evening.
4. Eat a lighter dinner. Heavy, fatty meals, such as a big plate of plov late at night, make sleep shallow. Try to finish dinner about 3 hours before bed.
5. Have a screen-free hour. Turn off your phone, TV and tablet an hour before bed, and charge your phone outside the bedroom. In one study, people who read on a light-emitting device in the evening fell asleep later and were less alert the next morning (PNAS, 2015).
6. Set up your bedroom. Keep it cool, dark and quiet: heavy curtains, and a sleep mask or earplugs if you need them. On hot summer nights, air the room out ahead of time.
7. Move during the day. Regular physical activity deepens sleep, but finish vigorous workouts at least 3 hours before bedtime (NIA).
8. Keep evenings free of alcohol and tobacco. Alcohol may make you drowsy at first, but it disrupts sleep in the second half of the night. Nicotine is a stimulant that makes it harder to fall asleep (NIA).

Your last hour before bed: a simple routine

Your body shifts into sleep gradually. A calm routine repeated every night tells it that it's time to wind down:

• Dim the lights and lay out tomorrow's clothes and to-do list.
• Take a warm shower or do a few gentle stretches.
• Try 10 minutes of calm: breathe in through your nose for 4 seconds and out slowly for 6. Prayer or a quiet talk with family works too.
• If your mind is racing, write tomorrow's plan on paper.
• Read a printed book instead of a screen.

How sleep changes with age

With age, sleep gets lighter: many people fall asleep earlier, wake earlier and wake more often at night. That's normal, but the need for about 7–8 hours stays (NIA).

Habits that help:

• Keep naps under 30 minutes and take them in the early afternoon.
• Drink most of your water earlier in the day so you wake up less at night.
• Some medicines affect sleep. Mention this to your doctor during your yearly medication review.
• Light the path from your bed to the bathroom with a small night light. It also helps prevent falls.

When to talk to a doctor

Sometimes better habits aren't enough. Talk to your family doctor if you notice:

• Ongoing insomnia. If trouble falling or staying asleep happens several nights a week for a few months, it's a treatable condition. The first-line treatment is CBT-I, which teaches you to adjust your sleep schedule, link your bed with sleep only, and change anxious thoughts about sleep (ACP, 2016; NHS).
• Loud snoring. Loud snoring, pauses in breathing during sleep and strong daytime sleepiness can be signs of sleep apnea. It responds well to treatment (NIA).
• Restless legs. An uncomfortable feeling in your legs in the evening, with an urge to move them.

Don't start sleeping pills on your own or use them long-term; decide together with your doctor.

Make good sleep a daily habit

The 100 Yosh app gives you a sleep task that fits your age: "Sleep 7–9 hours" from 16 to 64 and "Sleep 7–8 hours" after 65. The "Screens off an hour before bed" and "10 minutes of calm" tasks help you build an evening routine, and the Progress tab shows which days you stuck to your plan. The app is free and has no ads.

This article is for general information and is not medical advice — talk to your doctor before making decisions about your health.