Now a survey has pinpointed the most common time for our moment of panic - 4.05am.
And, according to the Bupa report, our top three concerns in the early hours are overdue dental check-ups, losing weight and tackling stress.
Despite the problem affecting 32 million adults, a fifth of us still say that dealing with a health issue is the least likely thing to be checked off a to-do list. Almost half say there is something “more important” to get done.
For instance, we are more likely to complete tasks related to work, finances or relationships.
But Dr Luke James, medical director of Bupa Health Clinics, warned that this attitude could lead to even worse health problems.
He said: “The issue is that persistent worrying can lead to further problems - blood pressure can go up and people can start suffering from things like heart palpitations.
“These are potentially more serious conditions, which can be much more difficult to bounce back from. It’s time for the nation to act, tick those actions off the list and worry less.”
The middle of the night is not the only time we worry about our health. We also worry in the shower and on the daily commute, the research pointed out.