The ALANIS project investigates how artificial light at night (ALAN) and coastal darkening affect aquatic ecosystems, particularly zooplankton diel vertical migration. Light changes disrupt predator-prey dynamics and key ecosystem functions. Using lab experiments, field studies, remote sensing, and ecosystem modelling, the project will assess zooplankton responses to varying light conditions across diverse European waters. Outputs include a high-resolution ALAN atlas and risk map, integrated into models predicting ecological impacts such as changes in export flux. Findings will support marine management and be shared through a Web-GIS platform for collaborative research and policy development.