What We Should All Be Doing

Some people think of sleep as the time when the body shuts down. According to sleep scientist Dr. Matthew Walker, the opposite is true. Sleep is an active biological process that supports nearly every aspect of physical and mental health.

In his book Why We Sleep, he argues that improving sleep may be one of the most powerful things we can do for our health, performance, mood, and longevity. The good news? Many of his recommendations are simple and cost nothing.

1. Keep a Consistent Sleep Schedule

Any effort to improve sleep should start with an effort to go to bed and wake up at roughly the same time every day.

Our bodies run on an internal 24-hour clock known as the circadian rhythm. Consistent sleep and wake times help synchronize this clock, making it easier to fall asleep, stay asleep, and wake feeling refreshed.

Sleeping in on weekends may feel good in the moment, but large shifts in schedule can create a form of "social jet lag" that disrupts sleep quality for days afterward.

2. Protect Your Sleep Opportunity

Most adults need somewhere between 7 and 9 hours of sleep per night. Yet many people schedule only 6 or 7 hours in bed and hope for the best.

Walker encourages people to think of sleep like any other important appointment. If you need eight hours of sleep and must wake at 6:00 AM, your bedtime should allow enough opportunity to achieve those eight hours consistently.

3. Reduce Evening Exposure to Bright Light

Light is one of the most powerful regulators of our biological clock.

Bright indoor lighting, televisions, tablets, and smartphones can delay the release of melatonin, a hormone that helps signal to the brain that it is time for sleep.

Experts recommend dimming household lights in the evening and reducing exposure to bright screens in the hour or two before bed whenever possible.

4. Get Morning Sunlight

Just as reducing evening light helps sleep, increasing morning light exposure helps anchor the body's circadian rhythm.

Spending even 10–30 minutes outside in the morning can help improve alertness during the day and promote better sleep at night. Natural sunlight is far more powerful than most indoor lighting.

5. Be Careful With Caffeine

Many people underestimate how long caffeine remains active in the body.

Caffeine has a half-life of roughly 5–7 hours. A coffee consumed at 2:00 PM may still have a substantial effect at bedtime.

Individuals vary in sensitivity, but many people sleep better when they avoid caffeine after late morning or early afternoon.

6. Limit Alcohol Before Bed

Alcohol may make people feel sleepy, but Walker emphasizes that sedation is not the same as natural sleep.

Research shows that alcohol can fragment sleep, reduce restorative REM sleep, and increase nighttime awakenings. While a drink may help someone fall asleep faster, the quality of sleep is often significantly worse.

7. Keep Your Bedroom Cool

Sleep is closely linked to body temperature regulation.

As we prepare for sleep, our core body temperature naturally declines. A cooler sleeping environment supports this process.

Ideal bedroom temperature is around 18°C (65°F), though individual preferences vary. Most people sleep better in a slightly cool room than a warm one.

8. Exercise Regularly

Physical activity is consistently associated with better sleep quality. Even moderate daily movement can have meaningful benefits for sleep. Intense exercise and workouts that challenge your balance serve to improve your sleep the most. That said, it's wise to avoid intense workouts before bedtime.

The key is consistency.

9. Don't Stay in Bed Awake

Laying in bed trying unsuccessfully to fall back asleep isn't a great idea.

If you find yourself unable to sleep for an extended period, it can be helpful to get up, engage in a calm activity under dim lighting, and return to bed when sleepy.

This helps your brain maintain a strong association between bed and sleep rather than bed and wakefulness.

10. Treat Sleep as a Health Priority

The most important message we get from the sleep experts is that sleep is not a luxury.

Quality sleep supports memory, learning, immune function, emotional regulation, cardiovascular health, metabolic health, and physical recovery. Chronic sleep deprivation has been linked to increased risks of numerous health problems.

In a culture that often celebrates busyness and short sleep, protecting sleep is one of the highest-return investments we can make in our well-being.

The Bottom Line

Work with your biology, not against it.

Maintain a consistent schedule, get morning sunlight, reduce evening light exposure, be mindful of caffeine and alcohol, keep your bedroom cool, exercise regularly, and give yourself enough time to sleep.