Study: Sleeping too much is more dangerous than not sleeping enough

The healthiest end-of-day sleep is 6 to 8 hours, but not more. Or less. As for napping, it depends on how you want to wake up.

It's obvious that being exhausted is no fun unless you're Keith Richards. For the rest of us, it's clear we're not at our best when we're too tired, and it's not much of a leap to understand it's not a healthy state in which to live, especially for one's cardiovascular system—heart issues and a greater incidence of stroke have both been associated with not getting enough sleep.


But how much sleep do you need to stay healthy? Depends on how you're getting it. For some, it's a matter of adjusting one's bedtime habits and schedule to get the best rest. For others—people with excessively long commutes or those whose schedules or dispositions preclude extended stretches in bed—it's about finding the most effective way to nap. Regardless, there are right ways and wrong ways to recharge your tired self.

The sweet spot for sleeping at the end of the day

At a recent European Society of Cardiology conference, researchers at the Onassis Cardiac Surgery Centre, Athens, Greece identified the cardiovascular sweet spot for end-of-day sleep. (We're phrasing it that way to accommodate people who work regular night shifts.) It's between six and eight hours a night.

To arrive at their conclusion, the researchers performed a meta-analysis of 11 previous sleep studies published in the last five years, using data collected from 1,000,541 subjects. The subjects were sorted into three groups. The reference group slept six to eight hours a night. Another group slept less than six hours, and the final group slept more than eight.

It turned out that those getting either less than six hours sleep or more than eight sleep were at significantly higher risk of developing or dying from coronary artery disease or stroke over the course of the next decade. (In the study, the average follow-up was 9.3 years.).

  • Subjects sleeping less than 6 hours were 11% more likely to develop cardiovascular issues
  • Subjects sleeping more than 8 hours were 33% more likely to develop cardiovascular issues

It's interesting to note that getting too much sleep is more dangerous than getting too little. Lead author Epameinondas Fountas sums up the findings: “Our findings suggest that too much or too little sleep may be bad for the heart. More research is needed to clarify exactly why, but we do know that sleep influences biological processes like glucose metabolism, blood pressure, and inflammation—all of which have an impact on cardiovascular disease."

Sweet spots, literally and figuratively, for napping

Nap pods

For those without the option of a full night's (day's?) sleep, or who need to be at their best from beginning to end of very long days, naps are often the only option. A new industry is springing up in cities around the world to provide busy people cozy places in which to catch some Zzzs.

One such solution is London's Pop & Rest accommodations, which started up as a kind of Airbnb-type business offering apartment spaces for napping. Now they have purpose-built 'sleep pods' located in what they describe as London's busiest districts. You can book a nook for 30 minutes to two hours, depending on your napping needs (see below).


A Pop & Rest nap pod in London (Image: Pop & Rest)

In addition, there are nap pods for sale that can be installed in quiet corners of a busy office…


For office snoozing, a PausePod (Image: PausePod)

… or in a secluded area in a busy airport.


Metronaps pods are popping up in various places, including airports. (Photo: Stan Honda/Getty)

The sweet spot nap for you

As one might expect of a company specializing in naps, Pop & Rest put together a great nap graphic. What makes it so helpful is that it tells you the best type of nap to have depending on what it is you want the nap to achieve.


(Image: Pop & Rest/Big Think)

Have the best rest

While the new sleep study is silent on napping, it stands to reason that your overall best bet health-wise is the six- to eight-hour end-of-day sleep. Still, that's not always possible, and some of us do just love naps, even should we get a full night's sleep.

And with that, we now bid you goodnight (no matter what time of day you read this).

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