2024 Yes https://journals.sagepub.com/doi/pdf/10.1177/00315125241230764?casa_token=0Y9nCMtH58UAAAAA:l_lywJSfmhMKwv6aH0gsEVvirXmHecjDDQZtqBl_9lKxf9SR1HmpwFui06N_2sWJ_Sq9cPlY2cBqTA Huo, Ming-Zhu Asia Observational Students Elementary (K-5) Lighting Vision light regularity light variability sleep regularity adolescence vacation light timing Higher SRI was significantly associated with more regular LRI scores during both school and vacation. There were no significant associations of SRI with variation in MLiT or daily photoperiod. Compared to school term, all three light regularity metrics were less variable during the vacation.