Light doesn't just act via the 'sleep hormone' melatonin

As recent research shows, light also affects a person's body and mind regardless of the time of day. Two studies investigated the effect of light, which was administered during the day when the darkness hormone melatonin does not come into play. The results showed a reduced subjective fatigue and an increase in psychomotor alertness.

Furthermore, an established group of Swiss researchers came to the conclusion that transcranial light, which was administered at night, does not inhibit the melatonin and also does not improve efficiency at night. This thus suggests that there must be alternative ways through which light unfolds its awakening effect.
These include light-sensitive opsins (OPN3 and OPN4) that are now the focus of new studies on animals and humans. This opsins are distributed behind the retina in the brain and prove the fact that the brain itself is sensitive to light.

Thus the encouraging and mood-brightening effect of light can also be taken advantage of without a reduction in melatonin. The Valkee daylight headset is based on this alternative way of thinking, where the Valkee team is committed to continuous research on the mechanism and the clinical effect of transcranial light therapy, in order to offer all those suffering from SAD an alternative to the traditional light therapy.