In news that will come as no surprise to anyone over the age of 30, new research has found it gets harder to sleep as we get older.

But it’s not young children, partners or weather sabotaging our precious rest, but biology, according to American sleep researchers.

A review of scientific literature published in the medical journal Neuron found adults begin to lose their ability to lapse into deep, restorative sleep from about their mid-30s.

And it’s no coincidence, the researchers say, that this is also about the time we start to show signs of aging.

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