Morning Light

Research summary

• Evidence in this dataset relates mainly to the broader role of light exposure and circadian rhythms in health, including reviews on circadian regulation of metabolism and cardiovascular function, plus more specific research on evening light exposure (e-readers) impairing sleep and light therapy improving insomnia.
• Direct trials isolating morning bright-light exposure specifically as an intervention are limited within this set; most support is inferred from the broader circadian-light literature rather than dedicated morning-light trials.
• The underlying circadian biology is well established and the American Heart Association has issued a formal statement on circadian health, but confidence in morning light specifically (versus circadian-supportive light exposure more generally) is moderate.