Abstract: A sleeping module and a modular sleeping structure with a plurality of sleeping modules. The sleeping modules has a housing which defines a space dimensioned to accommodate a user in at least a lie-flat position, an entrance to permit access to and exit from the space of the housing, an openable closure member provided with the housing to at least partially obstruct the entrance for isolating the space from the surroundings and a holder useful with the openable closure member is provided at the housing to releasably hold the openable closure member in a closed position by way of an attractive force.