SLEEP · 2006 · 266 citations · 21 references
These findings suggest that the 10-minute nap was overall the most effective afternoon nap duration of the nap lengths examined in this study. The implications from these results also suggest a need to consider a process occurring in the first 10 minutes of sleep that may account for the benefits associated with brief naps.
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Quantification of Sleepiness: A New Approach
Eric Hoddes, Vincent P. Zarcone, Harvey Smythe et al. · Psychophysiology · 1973 · 2.5K citations
Design and Analysis: A Researcher's Handbook
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