I would've suggested 'hypnotizing' yourself by freezing your body to shut off all bodily functions and fool the brain into thinking it's dead for a split second, before quickly restarting it to remove mental and physical hinderances until your brain realizes that you're not dead. Or use a minor version to reduce your internal temperature and render you invisible to thermal cams.

...It made sense in my head. I dunno. I'm not a biology specialist.