When are MIT students asleep?

In The Tech's survey, respondents were asked when they went to bed and how many hours of sleep they got on a typical weeknight. From this data, we've calculated the number of people asleep during any given 30-minute interval at night.

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Note: When viewing multiple groups of students (e.g. freshmen and sophomores), the data is based on raw numbers of respondents and not weighted according to enrollment.