Humans are diurnal animals and are inherently unable to function well at night or adjust to nocturnal schedules.
While humans are primarily diurnal, our circadian rhythms are quite flexible compared to many other animals. Humans can adapt to nocturnal schedules, though it may take time and require environmental cues. The variation in 'chronotypes' (morning people vs. evening people) reflects natural human diversity. Shift work, artificial lighting, and lifestyle changes have allowed humans to function effectively at night.
Reception
Sources
- Journal of Circadian Rhythms PRIMARY
- Sleep Foundation: Sleep and Circadian Rhythms REFERENCE