I'm a competition where ordinary people transform their lives through extreme challenges. My format has spawned numerous international adaptations, and contestants often endure sleep deprivation and significant emotional strain. Which reality TV show am I?

1. My winners often get more than just bragging rights; they get a life-changing sum of money.
2. My challenges test physical and mental fortitude.
3. Strategic alliances and betrayals are common.
4. My format is considered a social experiment.