[This episode is available as a video episode on YouTube and Spotify.] In occasion of International Day of Light (16 May 2024), the Light O’Clock team is bringing you an extra special episode: We answer your burning questions on the topic of light and circadian rhythms! Our host unpacks listeners’ questions with guest Prof. Dr. Manuel Spitschan from the Max Planck Institute for Biological Cybernetics and the Technical University of Munich. Links and resources related to the episode’s content: UNESCO International Day Of Light: https://www.lightday.org/ Recommendations for light exposure (Brown et al., 2022): https://journals.plos.org/plosbiology/article?id=10.1371/journal.pbio.3001571 How to activate the daylight exposure function on the Apple watch and iPhone: https://support.apple.com/guide/watch/see-time-in-daylight-apd3ab22534c/watchos#:~:text=The%20ambient%20light%20sensor%20in,Watch%20Series%206%20or%20later Questionnaire to determine chronotype: Munich Chronotype Questionnaire (Roenneberg et al., 2003): https://www.thewep.org/documentations/mctq