How many hours of sleep do adults actually need?

The National Sleep Foundation recommends 7-9 hours for adults aged 18-64, and 7-8 hours for those 65+. Individual variation exists — some people genuinely function optimally on 7 hours while others need 9. The most reliable indicator is how you feel without an alarm clock after a full week of adequate sleep. Consistent daytime sleepiness despite 7+ hours suggests you need more, or that sleep quality is impaired.

What is sleep hygiene and why does it matter?

Sleep hygiene refers to the set of behavioural and environmental practices that support consistent, high-quality sleep. Research consistently shows that sleep hygiene interventions are more effective at improving chronic sleep issues than medication in the long term. The strategies outlined in this article are the core components of cognitive behavioural therapy for insomnia (CBT-I), the gold-standard treatment for chronic insomnia.

Does exercising in the evening hurt sleep?

For most people, moderate-intensity exercise up to 2-3 hours before bed does not impair sleep quality and may even improve it. High-intensity exercise within 1-2 hours of bed can raise core body temperature and cortisol in ways that delay sleep onset for some individuals. The key variable is individual response — if you notice worse sleep after late evening training, shift it earlier.

When should I consider a sleep supplement?

Sleep supplements like melatonin are most useful for specific situations: adjusting sleep timing (jet lag, shift work, delayed sleep phase), establishing a new sleep schedule, or occasional acute sleep disruption. They are not a long-term solution for chronic poor sleep, which typically has behavioural or environmental causes best addressed through sleep hygiene and, in persistent cases, CBT-I with a sleep specialist.

How to Improve Sleep Quality Naturally – 9 Evidence-Based Strategies

Poor sleep is one of the most significant and underaddressed obstacles to health and fitness progress. Inadequate or low-quality sleep impairs muscle protein synthesis, elevates cortisol, disrupts appetite hormones (increasing hunger and cravings), reduces cognitive function and significantly increases injury risk. Yet most people respond to sleep problems by reaching for a supplement — when behavioural and environmental changes deliver far more powerful and lasting results.

These nine strategies are drawn from the scientific literature on sleep, including the evidence base for cognitive behavioural therapy for insomnia (CBT-I) — the most effective long-term treatment for sleep disorders. Most are free. All are evidence-based.

1. Keep a Consistent Sleep and Wake Time

Your circadian rhythm is anchored by consistent wake times more powerfully than any other factor. Set your alarm for the same time every day — including weekends — and get out of bed when it goes off. Within 2-3 weeks, your body will naturally begin to feel sleepy at the appropriate bedtime. This single strategy has the highest evidence base of any sleep intervention.

2. Create True Darkness

Melatonin production is suppressed by light — particularly blue-spectrum light from screens. Fit blackout curtains or a quality sleep mask. Dim all lights at least one hour before bed. Use night-mode on screens (warm, amber tone). Even small amounts of light reaching your eyes during sleep fragments sleep architecture and reduces REM quality.

3. Cool Your Bedroom

Core body temperature drops during sleep initiation. A bedroom temperature of 65-68°F (18-20°C) optimises this cooling process. If you frequently wake hot, consider moisture-wicking bedding. A cool shower before bed also accelerates the drop in core temperature, reducing time to sleep onset.

4. Limit Caffeine After 1 PM

Caffeine has a half-life of 5-6 hours. A 200mg coffee at 3 PM still has ~100mg active in your system at 9 PM, meaningfully reducing sleep quality even if you do not feel alert. Move your last caffeine source before 1 PM (noon for caffeine-sensitive individuals) and notice the difference within a few days.

5. Stop Alcohol Within 3 Hours of Sleep

Alcohol is commonly used as a sleep aid because it does accelerate sleep onset — but it dramatically reduces sleep quality in the second half of the night. It suppresses REM sleep, increases sleep fragmentation and worsens sleep-disordered breathing. Occasional drinks are fine; using alcohol as a nightly sleep tool is counterproductive.

6. Use Your Bed Only for Sleep

Working, watching TV or scrolling in bed creates a psychological association between your bed and wakefulness. Your brain learns to be alert in bed rather than drowsy. Use your bed only for sleep (and sex). If you cannot fall asleep within 20 minutes, get up and do something quiet elsewhere until you feel sleepy — then return to bed.

7. Get Morning Light Exposure

Bright morning light — ideally natural sunlight — is the most powerful circadian anchor available. 10-30 minutes of outdoor light exposure within one hour of waking advances your sleep timing and strengthens your circadian rhythm. On overcast days or in winter, a 10,000 lux light therapy box achieves a similar effect.

8. Manage Stress Actively

Rumination and anxious thought are among the most common causes of chronic insomnia. A 10-15 minute "worry journal" session in the evening — writing down concerns and next-day tasks — has been shown to reduce presleep cognitive arousal. Progressive muscle relaxation, breathing exercises (4-7-8 breath pattern) and body scan meditation are also effective for reducing physiological arousal at bedtime.

9. Consider Melatonin Situationally (Not Nightly)

For jet lag, shift work schedule transitions or occasional acute sleep disruption, low-dose melatonin (0.5-3mg) 30 minutes before the target bedtime is genuinely effective. It is not a sedative and works best for timing adjustment rather than as an ongoing nightly sleep aid.

Our top picks: Nature Made 3mg Tablets (ASIN B005DEK990, ~$0.05/night) for budget value, or Nature's Bounty 3mg Quick Dissolve (ASIN B000GG6D9A) for faster onset.

The Priority Order

If you implement only two of these strategies, make them consistent wake time and bedroom darkness. These two address the most common and highest-impact causes of poor sleep quality. Add the others progressively over 2-3 weeks as habits solidify.

How to Improve Sleep Quality Naturally