Light falling on the retina and being transmitted to the hypothalamus controls our circadian rhythms (Samuels 1990), which are responsible for synchronizing our internal clock to 24 hours (Light, Sight, and Photobiology 1998).

 
Comfort and productivity have been organized into four general categories: 
- Thermal Comfort
- Lighting 
- Lack of Individual Control 
- Acoustics 

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