Lambert C. Deep into Sleep // Harvard Magazine, July – August 2005.
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См., например: Takahashi M., Fukuda H., Arito H. Brief Naps During Postlunch Rest: Effects on Alertness, Performance, and Autonomic Balance // European Journal of Applied Physiology and Occupational Physiology 78, No. 2 (1998): 93–98, doi: 10.1007/s004210050392.
