- Study Ties 5 Subtypes of Sleep With Distinct Health And Lifestyle Patterns ScienceAlert
- Scientists Discover Five Types of Night Owls and Early Birds. Which Type Are You? ZME Science
- Study identifies five types of sleeper – which one are you, and what does it mean? The Independent
- Handmade by human hands using machines Digg
- Early bird or a night owl: Did you know there are 5 unique sleep subtypes? Moneycontrol
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