If you go to bed warm and non-hypothermic and then start to become so cold that you start developing hypothermia, the shivering to try to warm your body would become so violent that it would wake you up.
However, if you already had hypothermia and had stopped shivering and were drifting off to sleep, the odds would be higher that you would never wake up (unless someone started raising your body temperature to revive you).
Jackie was already freezing from spending all of that time trying to light her campfire, but stubbornly stayed outside and drifted off to sleep in the cold. Then the temperature dropped even further when it started to snow, which killed her.
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