I just did some research and now a days we are not declared Dead until.

the irreversible cessation of all of the following:

1 - total cerebral function, usually assessed by EEG as flat-line. ( at This moment your brain is already out )

2 - spontaneous function of the respiratory system.

3 - spontaneous function of the circulatory system.

source : Dorland's Illustrated Medical Dictionary, 31st Edition, republished on the website of Merck & Co, defined death as (accessed May 11, 2007)

That's why I thought we can't say that our brains live for X minutes after death since death is declared after all cerebral functions are down.

Tell me what you think ? and thanks for making us smarter :D