How to Increase REM Sleep: Science, Strategies, and Tools

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Have you noticed your fitness tracker constantly telling you that your REM sleep is low, leaving you wondering if you're actually resting at all?

To increase REM sleep, you need to extend total sleep duration and prioritize sleep continuity. The most effective strategies include maintaining a strict sleep-wake schedule, cutting off alcohol and caffeine well before bedtime, regulating nighttime bedroom temperatures, and managing evening stress to lower cortisol levels. Because the longest REM cycles happen in the final hours of sleep, avoiding early awakenings is critical for maximizing this restorative phase.

Understanding the mechanics behind REM sleep and where these behavioral changes fit in can help you maximize this phase and wake up feeling truly refreshed.

Understanding REM Sleep Physiology

The human sleep cycle is composed of two primary modes: Non-Rapid Eye Movement (NREM) and Rapid Eye Movement (REM) sleep. NREM sleep is further divided into three stages (N1, N2, and N3), with N3 being the deep, slow-wave sleep crucial for physical restoration. REM sleep, however, is when your brain becomes highly active, resembling a waking state.

During REM sleep, your breathing becomes faster and irregular, your heart rate and blood pressure increase, and your eyes dart rapidly behind closed lids. Your brain temporarily paralyzes your major voluntary muscles (a condition called atonia) to prevent you from acting out your dreams. This intense neural activity is essential for processing the day's events, consolidating memories, and regulating mood.

Interestingly, the proportion of REM sleep changes throughout the night. The first REM period usually occurs about 90 minutes after you fall asleep and lasts only ~10 minutes. As the night progresses, REM stages become longer, with the most extended periods happening in the hours just before you wake up.

Age-Related REM Norms

Our sleep architecture, including the amount of REM sleep we get, evolves over our lifespan. According to the Sleep Foundation, sleep staging changes dramatically as we get older.

• Newborns: Approximately 50% of their sleep is REM, essential for rapid brain development.
• Young Adults (20-30s): Usually achieve the optimal 20% to 25% REM sleep.
• Older Adults (65+): REM sleep often decreases as part of natural aging processes, meaning older individuals tend to spend less time in this restorative phase.

Understanding these age-related shifts is critical. A 65-year-old fretting over not hitting the 25% REM target seen on their wearable device may actually be achieving perfectly normal sleep for their age bracket.

Behavioral Techniques to Boost REM

Improving REM sleep doesn't happen by accident; it requires a deliberate approach to your sleep hygiene and daily habits.

Consistent Sleep Schedules

Your circadian rhythm—the internal clock that dictates your sleep-wake cycle—thrives on consistency. Going to bed and waking up at the same time every day, even on weekends, trains your body to expect sleep, making it easier to progress smoothly through all sleep stages, including REM. Because the longest REM cycles occur in the final third of the night, chronic sleep deprivation or waking up too early disproportionately robs you of REM sleep.

Prioritize Stress Reduction

High levels of stress and anxiety elevate cortisol and adrenaline, keeping your nervous system in a state of hyperarousal. If you are struggling with how to regulate cortisol, this persistent stress makes it difficult to transition into deep sleep and reduces the duration of REM phases. Integrating relaxation techniques before bed—such as mindfulness meditation, deep breathing exercises, or gentle stretching—can signal to your brain that it's safe to rest.

Optimize Your Sleep Environment

Your bedroom should be a sanctuary optimized for rest.

• Temperature: A cooler room (around 60–67°F or 15–19°C) supports the natural drop in core body temperature that initiates sleep.
• Light: Darkness signals the brain to produce melatonin. Use blackout curtains or an eye mask.
• Noise: A quiet environment minimizes sleep disruptions. Consider earplugs or white noise machines to drown out jarring sounds.

Nutrition, Substances, and REM

What you consume throughout the day, and particularly in the hours leading up to bedtime, has a profound impact on your sleep architecture.

Limit Alcohol and Caffeine

While a nightcap might help you fall asleep faster, alcohol is notorious for suppressing REM sleep, especially during the first half of the night. As the alcohol metabolizes, it often leads to "REM rebound"—abnormally intense, sometimes nightmare-filled REM sleep—but the overall quality of rest is compromised. Caffeine, a central nervous system stimulant, can delay sleep onset and reduce both deep and REM sleep. It's generally recommended to cut off caffeine intake at least 8 to 10 hours before bedtime.

Strategic Supplementation

• Magnesium: Magnesium plays a critical role in regulating the central nervous system and promoting relaxation, and there are many magnesium benefits to explore. As noted by the Mayo Clinic Press, magnesium can improve sleep quality by addressing underlying issues like anxiety or leg cramps that may otherwise disrupt sleep cycles. Furthermore, a recent review highlighted that magnesium regulates sleep health through multiple physiological mechanisms, with deficiencies shown to reduce plasma melatonin concentrations in rat studies (He et al., 2025).
• Melatonin: Melatonin is a well-investigated hormone that regulates the sleep-wake cycle. Studies indicate that supplemental melatonin can influence sleep structure in ways that support overall sleep quality (Shechter et al., 2012).

Note: Always consult a healthcare professional before starting any new supplement regimen to discuss appropriate dosages and potential interactions.

How Body Composition Can Impact Sleep

The physical makeup of your body can significantly influence your sleep quality. Numerous studies have highlighted an association between insufficient sleep duration and negative changes in body composition, including increases in body fat percentage and obesity risk (Kawasaki et al., 2023). Understanding the impact of sleep on muscle growth and fat loss is essential for anyone looking to optimize their fitness.

Conversely, carrying excess weight, particularly visceral fat around the abdomen, can lead to mechanical airway obstruction. This increases the risk of sleep apnea, a condition characterized by repeated breathing pauses during the night. These interruptions continually pull the brain out of deeper sleep stages and REM to resume breathing, leading to severe sleep fragmentation.

Conclusion

Understanding how to increase REM sleep starts with recognizing its vital role in cognitive function and emotional well-being. By prioritizing a consistent sleep schedule, optimizing your sleep environment, and being mindful of your nutrition and stress levels, you can create the ideal conditions for your brain to engage in this critical restorative phase. Remember that sleep architecture naturally shifts with age, so aim for progress rather than perfection based on a tracker's generic algorithm.

Because body composition is intimately linked with sleep quality, utilizing a clinical tool like a BodySpec DEXA scan can provide invaluable insights into your fat and muscle mass. This data helps you address physical factors that might be undermining your nightly rest.