Correct answer
Frequently changing usual sleep times.
Frequently changing usual sleep times can disrupt rest and contribute to drowsiness, for example with rotating shifts. Too little sleep can also cause it, and is not its only cause. Insufficient rest, some medicines and other factors may contribute. If sleepy, stop somewhere safe and rest; do not rely on opening a window or changing gear to keep from falling asleep.
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Adequate, regular rest eliminates every possibility of sleepiness in all circumstances.
Frequently changing usual sleep times.
Sleeping very little guarantees greater alertness.
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