The field of biology that examines periodic phenomena in living organisms and their adaption to solar and lunar related rhythms.

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Why aren't circadian rhythms exactly 24 hours long?

Most organisms exhibit circadian rhythms that have a periodicity of about, but not exactly 24 hours. Why is this? And to what extent can variation in periodicity in circadian rhythms among the ...
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What is the cause of singularity in phase response curve of human sleep and bright light?

I have no background in science as I am a computer programmer, but I am trying to get information on phase response curves, human sleep and exposure to bright light as I am trying to get to grips with ...