I rarely sleep longer than that, but it's not a training, simply comes with the age (I'm 40). Real question is how long would you sleep now if you could sleep a

I rarely sleep longer than that, but it's not a training, simply comes with the age (I'm 40). Real question is how long would you sleep now if you could sleep as much as you want? If every now and then you need to get a day of sleeping longer to re-energize, or you regularly have periods in night when you just can't keep your eyes open for a second longer, that probably means that you are not sleeping enough. On the other hand if you function like this in a stable manner, without sleeping "crisis", it's quite possible that you just don't need more than those 6-7h.