Final answer:
According to FM 6-22.5, a Soldier needs 7-9 hours of high-quality sleep per night to sustain operational readiness.
Step-by-step explanation:
According to FM 6-22.5, the minimum amount of hours of high-quality sleep a Soldier needs to sustain operational readiness is 7-9 hours a night.
While there is some variation in individual sleep needs, this range is generally recommended for adults.
Lack of sufficient sleep can lead to decreased alertness and mental efficiency, which can impact operational readiness.