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Sleep, Wikipédia édisi basa Inggris (20 Maret 2006).

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Morrissey, M. J., Duntley, S. P., Anch, A. M., & Nonneman, R. (2004). Active sleep and its role in the prevention of apoptosis in the developing brain. Medical Hypotheses, 62(6), 876-879.

Marks, G. A., Shaffery, J. P., Oksenberg, A., Speciale, S. G., & Roffwarg, H. P. (1995). A functional role for rem sleep in brain maturation. Behav Brain Res, 69(1-2), 1-11.

Mirmiran, M., Scholtens, J., van de Poll, N. E., Uylings, H. B., van der Gugten, J., & Boer, G. J. (1983). Effects of experimental suppression of active (rem) sleep during éarly development upon adult brain and behavior in the rat. Brain Res, 283(2-3), 277-286.

Zhang, J. (2004). Memory process and the function of sleep. Journal of Théoretics.Vol 6-6.