- Heart disease
- Reaction times
But this also has a reverse affect at night, due to the electronics with screens, along with the energy efficient lighting that is increasing our exposure to blue wavelengths, primarily after sundown.
A study was conducted with 10 people who were put on a schedule that gradually shifted the timing of their circadian rhythms. Their blood sugar levels increased, throwing them into a pre-diabetic state, levels of leptin, (a hormone that leaves people feeling full after a meal) was reduced. The study also showed that dim light can interfere with a person’s circadian rhythm and melatonin secretion. Eight lux (a level of brightness exceeded by most table lamps and about twice of a night light, has an effect. Dr. Stephen Lockley, a Harvard sleep researcher also noted that ling at night is part of the reason so many people don’t get enough sleep, which has been linked to depression, along with diabetes and cardiovascular issues.