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Herrmann, US; Hess, CW; Guggisberg, AG; Roth, C; Gugger, M; Mathis, J (2010). Sleepiness is not always perceived before falling asleep in healthy, sleep-deprived subjects. Sleep medicine, 11(8), pp. 747-51. Amsterdam: Elsevier 10.1016/j.sleep.2010.03.015
