Red Light Therapy for Better Sleep: The Melatonin Connection

Why Light Affects Sleep

Your body's internal clock — the circadian rhythm — is heavily influenced by light. Specialized cells in the retina detect light and send signals to the brain's suprachiasmatic nucleus, which regulates the release of melatonin, the hormone most associated with feeling sleepy.

During the day, bright light (especially blue-wavelength light) signals to your brain that it's time to be alert, suppressing melatonin production. In the evening, as natural light fades, melatonin production typically ramps up — preparing your body for sleep.

Blue Light vs. Red Light

The problem for many people in the modern world is that screens, LED lighting, and overhead fixtures emit significant amounts of blue light well into the evening. This can suppress melatonin production at exactly the time your body should be winding down.

Red light sits at the opposite end of the visible spectrum from blue light. Research on light exposure and circadian biology suggests that red wavelengths have a much smaller suppressive effect on melatonin compared to blue or white light. This is part of why red light is often recommended as an evening-friendly alternative to bright white light or screens.

The Melatonin Connection

Beyond simply avoiding blue light, there's growing interest in whether red and near-infrared light exposure may directly support the body's melatonin pathways. Some research has explored whether PBM exposure to the body — separate from the eyes — may help support natural melatonin levels, potentially through effects on the pineal gland and overall mitochondrial function (see our PBM science guide for background on the mitochondria connection).

While more research is always welcome in this area, the practical takeaway for most people is straightforward: swapping bright white/blue evening light for dim red light is a low-risk way to support your natural wind-down process.

Building an Evening Routine

Here's a simple approach many Lufalight customers use in the hour or two before bed:

• Dim the overhead lights. Reduce or turn off bright white/blue lighting in the bedroom and living areas an hour or two before bed.
• Use a short red light session. A 10-15 minute session with a facial device like the SleepGlow Eye Mask (EM04) or ClearGlow Pro Face & Neck Mask (G15P) as part of your wind-down routine.
• Reduce screen time. If you do use screens in the evening, consider lowering brightness and enabling "night mode" or warm color settings.
• Keep it consistent. Circadian rhythms respond best to consistent daily timing — try to use your routine at roughly the same time each evening.

Tips for Best Results

• Use red light sessions in a dimly lit room, not directly before checking a bright phone screen.
• Pair with other sleep-supportive habits: consistent bedtime, cool room temperature, and limiting caffeine later in the day.
• If you also use a device for muscle recovery (like the PainRelief Mini Pro), an evening session can serve double duty — supporting recovery while fitting naturally into your wind-down routine.

For more on how red and near-infrared light interact with your body at the cellular level, see The Science of Photobiomodulation.