Blue light is a type of high-energy visible (HEV) light with wavelengths ranging from approximately 400 to 500 nanometres. It’s naturally present in sunlight and plays an important role in regulating our circadian rhythm, our body’s internal clock that influences sleep and wake cycles.

However, artificial blue light is also emitted from digital devices like smartphones, tablets and computer screens, as well as from indoor LED lighting, televisions and fluorescent lights. This type of light mimics daylight and sends signals to the brain to stay alert.

Exposure to blue light after sunset can interfere with your body’s ability to produce melatonin, the hormone responsible for making you feel sleepy. This disruption can delay sleep onset, reduce sleep quality and throw off your natural sleep-wake cycle.

Wearing blue light blocking glasses in the evening - especially ones designed to block 100% of blue and green light between 400–550nm can help protect your circadian rhythm, support melatonin production and promote deeper, more restorative sleep.

Sleep glasses are designed to block the specific wavelengths of light - particularly blue and green light - that interfere with your body’s natural sleep signals. Blue and green light (in the 450–550nm range) suppress melatonin, the hormone that makes you feel sleepy. This can delay the time it takes to fall asleep and disrupt sleep quality.

Our amber Blue+™ Sleep lenses are engineered to filter out disruptive blue light wavelengths (450–500nm), making them perfect for use after sunset. They allow you to wind down naturally while still seeing clearly and comfortably.

For maximum protection, our red lens sleep glasses block 100% of blue and green light, helping to maintain healthy melatonin levels and promote deeper, more restorative sleep. These are ideal for those who are especially sensitive to light or want the most powerful sleep support.

By wearing sleep glasses in the evening, particularly 1–2 hours before bed, you support your body’s circadian rhythm, fall asleep faster and improve overall sleep quality.

Yes, studies have shown that wearing blue light blocking glasses for a few hours before bedtime can increase melatonin levels and improve sleep quality.

You should start wearing your Sleep Glasses in the evening, around 1 to 2 hours before bedtime. This is when your body naturally begins producing melatonin to prepare for sleep - but exposure to artificial blue and green light from screens, indoor lighting, and other sources can disrupt this process.

We don’t recommend wearing red lens Sleep Glasses during the day, as they block 100% of blue and green light (400–550nm), which your body actually needs during daylight hours to stay alert, focused and energised.

During the day, we suggest wearing our clear blue light filtering glasses. These are specifically designed to filter out just the harshest part of blue light (400–450nm) from screens and LED lighting, helping reduce digital eye strain, fatigue and headaches - without disrupting your body’s natural circadian rhythm.

In the evening, once the sun sets, it’s time to switch to your amber or red lens Sleep Glasses. These block the wavelengths of blue and green light that suppress melatonin - the hormone that signals to your body that it’s time to sleep. Wearing them after dark helps protect your melatonin production, supports your circadian rhythm and leads to deeper, more restorative sleep.

Wearing the right lenses at the right time of day is key to staying energised by day and sleeping soundly at night.