Gianne Derks is visiting Piet Hein van de Graaf and Vivi Rottschafer at the University of Leiden this week (1-3 July), and giving the opening lecture at the Minisymposium on Applied Dynamical Systems on Thursday.  Her talk is on “The dynamics of sleep-wake regulation, from maps to naps.”  The talk was based on joint work with Derk-Jan Dijk (Surrey Sleep Research Centre) and Anne Skeldon.