With this biphasic sleep schedule, people swap the long siesta for a short, 20- or 30-minute nap during the day. At night, they sleep longer, such as for six or seven hours per night. First/Second Sleep Schedule: The original biphasic sleep schedule, from the preindustrial era, split sleep into two segments during the night. People would have their first sleep around 9 p.m. or 10 p.m., wake up around midnight for an hour or two, and then have their second sleep after that. With each biphasic sleep schedule, the person should still obtain a total of at least seven hours of sleep per 24-hour period.Back in my late teens when I was in A-levels and later my undergraduate university days,
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