During circadian low, maximum sleepiness occurs between which times?

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Multiple Choice

During circadian low, maximum sleepiness occurs between which times?

Explanation:
The strongest sleep drive from the circadian system appears in the pre-dawn hours. At this time, melatonin is high and the body’s temperature is at its lowest, signaling the brain that it’s time to sleep. That combination makes you feel the most sleepy in the early morning, before dawn. The other windows correspond to times when wakefulness is more likely or a smaller dip occurs, but they don’t hit the main circadian nadir. So the maximum sleepiness occurs in the early-morning hours.

The strongest sleep drive from the circadian system appears in the pre-dawn hours. At this time, melatonin is high and the body’s temperature is at its lowest, signaling the brain that it’s time to sleep. That combination makes you feel the most sleepy in the early morning, before dawn. The other windows correspond to times when wakefulness is more likely or a smaller dip occurs, but they don’t hit the main circadian nadir. So the maximum sleepiness occurs in the early-morning hours.

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