Sleep deprivation - the biggest complaint of adults.
Whether lack of shut-eye is down to studying, partying, shift work or night feeds - not getting enough rest is pure torture.
That's why the power nap is our saviour. A quick snooze boosts energy and productivity.
However, a new study's found naps are bad for your health.
Researchers at the University of Tokyo discovered that napping for 40 minutes or longer is linked to developing metabolic syndrome.
Metabolic syndrome is as a cluster of conditions - high blood pressure, high cholesterol, high blood sugar and excess fat around the middle - that occur together, increasing your risk of heart disease.
Researchers analysed 21 observartional studies involving more than 300,000 people.
They found a quick nap that lasts less than 40 minutes did not show an increased risk for metabolic syndrome.
But the risk for developing the condition rose sharply if people napped beyond 40 minutes.
In fact, people had a 50 per cent increased risk of developing metabolic syndrome if they napped for 3 hours.
Interestingly, researchers noticed a lower risk of developing metabolic syndrome if they napped less than 30 minutes.
Lead author of the study, Tomohide Yamada, said:
"Taking naps is widely prevalent around the world. So clarifying the relationship between naps and metabolic disease might offer a new strategy of treatment, especially as metabolic disease has been increasing steadily all over the world."
"Short naps might have a beneficial effect on our health, but we don't yet know the strength of that effect or the mechanism by which it works."
OK, so we can still nap...phew! Just keep them short and sweet.
