the 12 day rule.

[Tonka]

I think this is an important subject for a UK forum, as the 'die off' is more important here than most of the world, due to population density. A country with more people than there is farm land to support them is going to go tits up quicker than putting on a Wonderbra!
It's a sad, but in a long term situation (big NEO impact and the like), a UK prepper really can't get on with any long term surviving (farming etc) until a sufficient percentage of people a have karked it.
There are so many variables, I think it's going to be hard to get a consensus on when that would be though. I also think it would vary all over the country.

Sleep need seems to vary from person to person. Personally, I really can't function on much less than 6 hours for more than a couple of days. My immune system seems to shut down. Other people around me seem to cope better, I just seem to be particularly susceptible to that.

At least I have few extra of those '5 day lbs' to keep me going.