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A new study has shown too much sleep might increase your risk of heart disease and early death.
But don't start getting up earlier just yet.
There are limitations to the study, such as sleep duration and quality been self-reported, which doesn't always give accurate data.
Also it doesn't mention circadian rhythms — body clocks — which are closely intertwined with out sleep cycles.
To make the most of your sleep, the advice remains the same: consistency is...