The announcement of loosening the covid rules on January 25 (in the Netherlands) will make live a little easier for many people. But the night scene will stay locked for a while longer because from 10 PM all bars remain closed. Editie NL (dutch national news channel) asked BioClock coordinator and professor LUMC Joke Meijer how the absence of this night life may affect adolescents. The mental health of these students has declined in the past year and the COVID rules have further decreased those. Therefore this is also part of BioClock, as within WP1.4 we investigate how improving sleep may improve mental health of adolescents.