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"those exceeding 30 minutes, could lead to sleep inertia", "Naps can also be helpful to one's alertness when 30–60 minutes long.", and "a 20-minute nap can improve your overall alertness"
It seems the first and third agree with each other and the second disagrees with the other two. Anyone else have an opinion? Schnarr06:16, 24 September 2009 (UTC)[reply]