Yes, blue light exposure worsens sleep quality: https://www.health.harvard.edu/staying-healthy/blue-light-has-a-dark-side https://www.health.harvard.edu/stayin

Yes, blue light exposure worsens sleep quality: https://www.health.harvard.edu/staying-healthy/blue-light-has-a-dark-side https://www.health.harvard.edu/staying-healthy/blue-light-ha... We kind of even know why, because of blue light receptors in our eyes linked to hormones released in the morning to increase alertness. This is linked to the light spectrum seen at sunrise.