Weekends are my saving grace - I wake up at 4 a.m. during the week, and I have zero qualms about sleeping until 10 on the weekends (or as late as my children allow).
This study relied on people to describe their own sleep habits, which can generate a "mish-mosh", in Lauderdale's view, of "accurate and less accurate information".
After a long week of working, most people like to just sleep in all day during the weekends.
"They sleep as much during weekdays as during weekends whereas the difference is huge in lower age groups", he explained.
"The duration of sleep is important for longevity", said Thorbjorn Akersted of the Stress Research Institute in Sweden, quoted by The Guardian. "This suggests that short weekday sleep may be compensated for during the weekend". They might sleep six hours or slightly less. Among individuals ≥65 years old, no association between weekend sleep or weekday/weekend sleep durations and mortality was observed.
Once factors such as gender, body mass index, smoking, physical activity and shift work, were taken into account, the results revealed that those under the age of 65 who got five hours of sleep or under that amount seven days a week had a 65 per cent higher mortality rate than those getting six or seven hours' sleep every day.
Previous studies have found a U?shaped relationship between mortality and (weekday) sleep duration.
After a week of early starts, most people look forward to having a long lie-in on the weekend and it turns out that by doing so we're actually prolonging our life. He thinks a lot of people may relate to sleeping less during the week and, at the very least, may want to have an excuse for sleeping in on our days off. "Perhaps it's giving them hope that this habit is in some way good for them".