According to an Australian study relaxing too much could have an adverse effect on our life expectancy. Not very good news for those of us who like a few extra hours in bed in the morning.We all have those days right? Usually Sundays, we have a lie in, relax and frankly, just laze around. Apparently it's not such a good idea! Well, that's according to an Australian study that says that too much rest reduces life expectancy. 'They (the study) have highlighted the practices for poor aging: if you sleep more than nine hours a night in addition to doing less than 150 minutes of physical exercise a week, you increase the risk of sudden death by four' explains Dr Saldmann to French news channel, RTL.Exercise your brain The doctor goes on to say 'Whenever you are physically lazy, you will lose muscle... just like when you don't exercise your brain, your IQ suffers'. Physical exercise, as well as keeping your brain in good shape, is therefore essential for remaining healthy. So, get up of the couch, read a good book, or go for a jog round the park!