Have you ever heard the phrase "social jetlag" before? No, me neither.
It means you sleep longer on days when you're not working, and this, like many other things, is bad for you.
Kiwi scientists believe that lazy weekend lie-ins mess with your metabolism and lead to obesity and 'other chronic disorders'. It is difficult to find something which does not lead to obesity these days, it seems.
Well these bright Kiwis have even put cold hard numbers to this theory, suggesting that for every 2 hours of sleep over what you would normally have, you are liable to put on about 2.5 kilos. I am guessing this takes place over the long term rather than overnight, as that would be kind of bizarre.
Keep that alarm clock set for Saturdays and Sundays if you know what's good for you!