The endogenous clock can be adjusted through a variety of means, though the most common is light. 
- Phase shift
- Entrainment 


Changes in biological rhythms

- Sleep stages
- Sleep patterns over a lifetime
- Sleep onset
- Sleep regularity
- Biological functions of sleep
- Neural systems underlying sleep
- Sleep deprivation
- General anesthetics
- Sleep disorders
- Tracking Information During Sleep
- Sleep-wake cycle

Sleeping and waking

- Circadian rhythms
- Infradian rhythms
- Ultradian rhythms
- Free-running

Types of biological rhythms and clocks

- Types of biological rhythms
- Sleeping and waking
- Changes in biological rhythms
- Suprachiasmatic Nucleus

California Polytechnic State University, San Luis Obispo

All living systems, human or otherwise, have predictable rhythms of biological activity that they follow. There are daily rhythms such as sleeping or eating, and annual ones like hibernation.

Biological rhythms

Breedlove, S. & Watson, N. (2017). Behavioral neuroscience, eighth edition. Oxford University Press.

Behavioral Neuroscience 8th Edition

Focuses of Biological Rhythms

A researcher observes a species of plant in a laboratory with no windows and constant, unchanging artificial light. Despite the lack of external day/night cues, the plant's leaves consistently open in the morning and close in the evening on a roughly 24-hour cycle. Which of the following concepts best explains the plant's behavior?

Analyze the following scenario and explain the underlying biological principle that accounts for the described issues.

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