article 2019 Effect of napping opportunity at different times of day on vigilance and shuttle run performance Raouf Abdessalem, Omar Boukhris, Hsen Hsouna, Khaled Trabelsi, Achraf Ammar, Morteza Taheri, Khadijeh Irandoust, David W. Hill, Hamdi Chtourou JournalChronobiology InternationalDOI10.1080/07420528.2019.1642908 View on DOI ↗