LED Screen Glare, Often Said to Cause Insomnia
This page is the CodyCross answer for the clue below from Past and Present Tech, Group 1456, Puzzle 4 (Dishwashers).
Question is: LED Screen Glare, Often Said to Cause Insomnia
and the answer is: BLUELIGHT
Word Meaning:
BLUE LIGHT — (historical, chiefly nautical) A mixture of chemicals (including nitre, sulfur and antimony) used in the eighteenth and nineteenth centuries for night-time signaling and general illumination.
Definitions from Wiktionary.