Products That Support Better REM Sleep
Every product on this page was selected because it directly addresses one of the six factors that control REM sleep quality. These are not sponsored placements. They are the best tools available in each category based on evidence and real-world effectiveness.
If you are new here, start with temperature. It is the highest-leverage change most people can make and the one most people have not considered.
Temperature Control
Good Sleep System — Water-Cooled Mattress Topper
Our top recommendation for improving REM sleep through temperature control. The Good Sleep System circulates temperature-controlled water through a mattress pad, maintaining your selected temperature between 55 and 110 degrees Fahrenheit all night. This directly addresses the most common cause of suppressed REM: a sleep surface that is too warm.
Unlike passive cooling products such as gel toppers or bamboo sheets, the Good Sleep System maintains its temperature actively throughout the entire night. Passive products wear off within an hour. Active water cooling works from the moment you fall asleep until you wake up.
Why we recommend it:
- Water-based active cooling and heating, the same technology used in Eight Sleep at a fraction of the cost
- No subscription required, ever
- Single unit covers the entire bed
- Works without WiFi or a smartphone app
- Compatible with any mattress size and type
- Near-silent operation
Our score: 9.6/10
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Sleep Supplements
Magnesium Glycinate
The supplement with the strongest evidence base for improving sleep quality. Supports GABA activity and muscle relaxation. Take 200 to 400mg approximately 60 minutes before bed. Look for glycinate specifically, not magnesium oxide or magnesium citrate, which have lower bioavailability for sleep purposes.
Evidence strength: Strong. Category: Non-prescription supplement.
L-Theanine
An amino acid found in tea leaves that promotes alpha brain wave activity and reduces the mental activation that delays sleep onset. 100 to 200mg taken 30 to 60 minutes before bed. Works well combined with magnesium glycinate. No morning grogginess.
Evidence strength: Strong. Category: Non-prescription supplement.
Low-Dose Melatonin
Most over-the-counter melatonin products contain 5 to 10mg per dose. Research shows 0.5 to 1mg is as effective for most uses and does not suppress natural melatonin production over time. Look for low-dose formulations or cut standard tablets. Most useful for travel, shift work, or resetting an irregular sleep schedule.
Evidence strength: Strong for timing. Category: Non-prescription supplement.
Glycine
An amino acid that lowers core body temperature through vasodilation. Particularly useful for people who run warm. Take 3g dissolved in water 30 minutes before bed. Works synergistically with active mattress cooling.
Evidence strength: Moderate. Category: Non-prescription supplement.
For full dosing guidance and what to avoid, see our complete supplement guide.
Sleep Environment
Blackout Curtains
Any light exposure during sleep can trigger micro-arousals and shift sleep toward lighter stages. Blackout curtains that cover the full window are the most effective and permanent solution. A well-fitted sleep mask is a lower-cost alternative. This is a one-time purchase with a lasting impact on sleep quality.
Impact: High. Cost: Low to moderate.
White Noise Machine
Environmental noise causes sleep fragmentation even when it does not fully wake you. A dedicated white noise device provides a consistent auditory masking signal that prevents these micro-arousals. A standard fan or air purifier also works if the noise is consistent.
Impact: High for noise-sensitive sleepers. Cost: Low.
Sleep Tracking
Apple Watch Series 6 and Later
Estimates sleep stages including REM using heart rate variability and movement data. Accuracy is sufficient for tracking trends over time. If you already own an Apple Watch, activate sleep tracking in the Health app tonight. No additional purchase required.
Oura Ring Generation 3
Widely considered the most accurate consumer sleep tracker available. Ring form factor is comfortable for sleep. Provides detailed REM, deep sleep, and HRV data. Requires a subscription after the initial period. Best option for people who want the most detailed data.
Fitbit Sense or Charge Series
Good sleep stage tracking at a lower price point than Oura. Works well for people who prefer a watch form factor and are already in the Fitbit ecosystem.
For a detailed comparison of sleep trackers and their REM accuracy, see our sleep tracker guide.
A Note on Product Recommendations
We update this page quarterly as new products enter the market and existing products change. Our recommendations are based on evidence strength, real-world effectiveness, and value for money. Affiliate commissions do not influence which products appear here or how they are ranked. See our affiliate disclosure for full details.