Humans used to have a ‘first sleep’ and ‘second sleep’ at night. Here’s why that changed.

We used to have a few productive hours in the middle of the night, but that all went away during the Industrial Revolution.
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Is biphasic sleep healthy?

Taking short naps under 30 minutes can boost energy and alertness. Biphasic sleep patterns may compromise sleep quality, compared to polyphasic and monophasic sleep patterns. Biphasic sleep may not be ...
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Alternative Sleep Cycles: How to Survive on 3 Hours of Sleep Each Night

Sleeping for 7 to 9 hours at night isn't the only way to catch some z's. Here are four alternative sleep cycles -- and they're pretty obscure. Annie Miller Medical Reviewer Annie Miller is a licensed ...