Dhand, Rajiv; Sohal, Harjyot (2007). "Good sleep, bad sleep! The role of daytime naps in healthy adults". Current Opinion in Internal Medicine. 6 (6): 91–94. doi:10.1097/01.mcp.0000245703.92311.d0. PMID17053484.
Mollicone, Daniel J.; Van Dongen, Hans P.A.; Dinges, David F. (2007). "Optimizing sleep/wake schedules in space: Sleep during chronic nocturnal sleep restriction with and without diurnal naps". Acta Astronautica. 60 (4–7): 354. Bibcode:2007AcAau..60..354M. doi:10.1016/j.actaastro.2006.09.022.
Mollicone, Daniel J.; Van Dongen, Hans P.A.; Dinges, David F. (2007). "Optimizing sleep/wake schedules in space: Sleep during chronic nocturnal sleep restriction with and without diurnal naps". Acta Astronautica. 60 (4–7): 354. Bibcode:2007AcAau..60..354M. doi:10.1016/j.actaastro.2006.09.022.
Dhand, Rajiv; Sohal, Harjyot (2007). "Good sleep, bad sleep! The role of daytime naps in healthy adults". Current Opinion in Internal Medicine. 6 (6): 91–94. doi:10.1097/01.mcp.0000245703.92311.d0. PMID17053484.