Biological rhythms

• Limitations

  Findings from animal studies can't be generalised to humans

  Humans have greater adaptability
• Limitations

  Studies that have deprived humans of natural light have allowed artificial light, not giving benefits of natural light
• Limitations

  Individual differences need further study, some people more alert at different times in the day
• Limitations

  Understanding jetlag means we can limit affects of it but this hasn't happened