Light and sleep health
Blue light isn’t the enemy. Timing is the point.
Daytime light helps anchor the body clock. After dark, blue-rich light from screens and bright indoor lighting can delay the signals that help you wind down.
The same light. A different time of day.
Seek useful light
Bright daytime light supports alertness and helps keep the sleep–wake cycle aligned. The aim is not to avoid blue light around the clock.
Lower the daytime signal
In the hours before bed, blue-rich screens and bright lamps can suppress melatonin and push the body clock—and sleep—later.
After-dark sources
Look beyond the phone.
Phones, tablets, laptops and televisions are obvious sources. Bright LED bulbs, overhead lighting and late-working environments can contribute too.
The effect depends on timing, brightness, duration and how much melanopically effective light reaches the eye.
Practical foundations
Build contrast between day and night.
Get morning light
Spend time in bright light after waking, preferably outdoors when practical.
Dim the room
Use warmer, lower lighting as bedtime approaches and reduce unnecessary overhead glare. At lights-out, keep the bedroom dark, quiet and comfortably cool.
Keep a steady schedule
A reasonably consistent sleep and wake time gives the body clock a clearer rhythm.
Protect the wind-down
If screens remain part of your evening, reduce their biological light signal rather than expecting willpower to remove them entirely.
Where SleepSpec fits
One tool for the hour before bed.
SleepSpec blocks 98% of blue-green light across 400–520 nm. Wear the deep-amber lenses 1–2 hours before bed, then remove them at lights-out.
Glasses are one part of an evening routine, not a treatment or a substitute for medical advice. SleepSpec is not a medical device, and individual results vary.