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Why does not getting enough sleep make you selfish?
Thanks for asking. Not getting a good night's sleep can certainly leave you feeling grumpy and groggy.
But can it also make you selfish?
Sleep experts at the University of California, Berkeley certainly seem to think so.
And apparently, even losing just one hour of sleep is enough to make you less generous towards others, and that includes friends and family.
How did they discover this?
The team conducted a number of experiments.
Over 100 participants were asked to fill out an altruism questionnaire with questions like Would you help if a stranger stopped to ask for directions while you were in a rush to get to work?
They answered on a scale from I would stop to help to I would ignore them.
Results showed that those with poorer quality sleep in general were significantly less generous than people who had slept better.
In another experiment, researchers compared answers from the same person, first after a good night's sleep, then after 24 hours without a wink.
Results showed a huge 78 % decrease in their willingness to help others after having had no sleep.
Brain scans were also taken of some volunteers and revealed that being sleep deprived reduced activity in the social cognitive brain network, a region involved in social behaviour and empathy.
But researchers didn't stop there.
The team then tracked more than 3 million charitable donations in the US before and after clocks were put forward for daylight saving time.
They found a 10 % drop in donations after the transition, but this decrease was not observed in states that did not put their clocks forward.
So what impact could this have?
Well, considering that more than half of all people in developed countries say they get insufficient sleep, the impact could be quite serious.
Certainly for people needing directions at least.
Links between lack of sleep and mental health disorders such as anxiety and depression are already known.
And there is also research to show that it can have an impact on our physical well -being, leading to ailments such as diabetes and obesity.
But now a lack of sleep can make us less empathetic.
And in a world where Netflix, TikTok and a myriad of other things all call for our attention 24 -7, eager to keep us awake and scrolling, getting enough sleep seems harder and harder.
So is there any hope?
Well, yes. Thankfully, we can catch up on our sleep, and once we do, we return to our old empathetic selves.
Although the scientists have noted that it is not only quantity, but also quality of sleep that counts.
However, it does have wider implications for those people who regularly have disrupted sleep.
People working night shifts, which includes first responders, doctors, nurses, police and shift workers who are often critically sleep deprived.
Maybe it's time for us all to prioritise sleep for our own health and for the people around us.
There you have it. Now you know why not getting enough sleep makes you selfish.
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