During normal conditions one can very well do with 6 -7 hours of sleep but when you are very exhausted or have had some health problem, then the more you sleep the better for the system to recover. I have seen some people sleeping 12 hours at a stretch when they are really exhausted...

12 hours sleep only possible when stretched otherwise it is bad also to health.

I have seen many of my friends who has slept for more than 12 hours. It is really not good. This makes us little obese.

During normal conditions one can very well do with 6 -7 hours of sleep but when you are very exhausted or have had some health problem, then the more you sleep the better for the system to recover. I have seen some people sleeping 12 hours at a stretch when they are really exhausted...

12 hours sleep only possible when stretched otherwise it is bad also to health.

I have seen many of my friends who has slept for more than 12 hours. It is really not good. This makes us little obese.

On the other hand I have read that sleeping in fact is good fro reducing because it cuts down on hunger and your eating capacity to that extent...
http://thyroid.about.com/od/loseweightsuccessfully/a/sleepdiet.htm

@Vinodh... 12 - 14 hours...!! don't you think that is quite more.. Even if someone is sleeping for 8 to 8 which is for 12 hours then also it is quite more and you are telling you are sleeping that much or even more (on weekends) ...

Okay Vinodh.. Sunday is day where no rule applied.. So can be enjoyed in any ways ... ;)