Research Methodology.
All the previous studies mentioned had no proper external cues and all support each other. But on the other hand, they all used dim, artifical lighting and this has been shown to have an affect on our biological rhythms. Czeisler et al., (1999) did an experiment with altering the rhythms using dim lighting and managed to reduce it to 22 hours and up to 28 hours.
Individual Differences.
People's length of sleep-wake cycles vary from 13 hours to 65 hours, (Czeisler et al., 1999.)
Also, our onset is different from person to person; from a morning to an evening type of person, (Duffy et al., 2000.)
Comments
Report
Report