I think the trick to using survival instincts to your advantage would be to maintain the awareness with sleeping lightly. Perhaps that is simply trusting your instincts to kick in at the right time, or using specific practices to enhance those instincts.
It reminds me of working with your strengths. We have certain aspects and qualities of ourselves already that lend to awareness. Then if we can learn to use them to our advantage, that would increase our ability to utilize them.
Good thoughts!
:)