@article{takeyama_matsumoto_murata_ebara_kubo_tachi_itani_2004,  title={Effects of the length and timing of nighttime naps on task performance and physiological function},  volume={38},  ISSN={0034-8910},  url={https://doi.org/10.1590/S0034-89102004000700006},  DOI={10.1590/S0034-89102004000700006},  journal={Revista de Saúde Pública},  publisher={Faculdade de Saúde Pública da Universidade de São Paulo},  author={Takeyama, Hidemaro and Matsumoto, Shun and Murata, Kensaburo and Ebara, Takeshi and Kubo, Tomohide and Tachi, Norihide and Itani, Toru},  year={2004},  month={Dec},  pages={32–37} }