Interim NIOSH Training for Emergency Responders: Reducing Risks Associated with Long Work Hours

Circadian Rhythms Promote Wakefulness

Figure 3 shows the rise and fall of circadian rhythms for wakefulness.

The circadian rhythms

  • Create a peak in wakefulness in the evening, a few hours before bedtime
  • This may increase alertness in early evening, even after being awake for long periods of time, and may make it difficult to go to bed earlier.
The rise and fall of circadian rhythms, which promote wakefulness across the 24-hour day.
Figure 3

The rise and fall of circadian rhythms, which promote wakefulness across the 24-hour day.

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Page last reviewed: April 1, 2020