Extreme morning chronotypes are often familial and not exceedingly rare: the estimated prevalence of advanced sleep phase, familial advanced sleep phase, and advanced sleep–wake phase disorder in a sleep clinic population
Brian John Curtis, Liza H Ashbrook, Terry Young, Laurel A Finn, Ying-Hui Fu, Louis J Ptáček, and Christopher R Jones

Evening intake of alcohol, caffeine, and nicotine: night-to-night associations with sleep duration and continuity among African Americans in the Jackson Heart Sleep Study
Christine E Spadola, Na Guo, Dayna A Johnson, Tamar Sofer, Suzanne M Bertisch, Chandra L Jackson, Michael Rueschman, Murray A Mittleman, James G Wilson, and Susan Redline

Evidence for sleep-dependent synaptic renormalization in mouse pups
Luisa de Vivo, Hirotaka Nagai, Noemi De Wispelaere, Giovanna Maria Spano, William Marshall, Michele Bellesi, Kelsey Marie Nemec, Shannon Sandra Schiereck, Midori Nagai, Giulio Tononi, and Chiara Cirelli