According to a new survey, women need at least at 15 days more sleep each year than they get. Men are 10 days short of sleep on average.
In the survey of 2,000 adults, on average people said they needed seven and a half hours sleep per night.
Women said they usually get six hours 21 minutes per night, but want seven hours 23 minutes. They have an average sleep deficit of one hour two minutes, which adds up to 15 days 17 hours annually.
Men said they get six hours three mins sleep on average, but believe they need six hours 40 mins to feel rested. Their sleep deficit is 40 minutes per night, adding up to a shortfall of 10 days three hours per year.
Work worries, snoring partners and issues with family or friends were listed as the most common things keeping us awake.
The survey was conducted by iCukoo, a new app which allows users to donate to a charity of their choice every time they hit snooze on their alarm.
Professor Russell Foster, chair of Circadian Neuroscience and head of the Sleep and Circadian Neuroscience Institute at the University of Oxford, said sleep is "the single most important health behaviour we have."
"It affects everything from our day-to-day functioning to our long-term physical and mental health," he added.