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Why did many people in preindustrial Europe sleep in two shifts?. Center the post on a simple night timeline showing first sleep, a waking interval, and second sleep, with one key takeaway. Add one modern connection about how artificial light reshaped sleep expectations.

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    Biphasic Sleep
    In preindustrial Europe, people slept in two shifts – a first sleep at dusk, a wakeful interval for chores and chats, then a second sleep until dawn. Later, electric light merged sleep into one long block. How does your sleep feel?

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