Exposure to light through the eyes helps regulate the body’s sleep/wake cycle by affecting the pineal gland’s secretion of melatonin.

This hormone is produced at night and promotes drowsiness; exposure to light, notably blue light, suppresses it.

This is one way sunlight contributes to alertness, and why lack of light at night helps increase sleepiness.

http://www.wellnessletter.com/ucberkeley/feature/it%E2%80%99s-late-turn-off-that-computer/#

download this free app  http://stereopsis.com/flux/ to regualte the ‘blue light’ to an ‘amber’ on your ipad, desktop, or smartphone screen. 

Sweet dreams!

Krista Lynn Reid