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spec: Health spending in the United States is already enough to cover all Americans -- if we better use the vast sums now wasted on ineffective care and paperwork . Table 3 presents the median DST decrements and amount of Stages 2 +3 +4 sleep for these groups on each nap day , as well as subjects with similar amounts of Stages 2 +3 +4 sleep who were awakened from Stage 2 and Stage 4 sleep .