Humans live in repetitive, roughly 24-hour rhythms – daylight represents a significant influence on sleep and wake times during these episodes. Our internal clock, in turn, determines when we are active and how.
However, shift work and other influencing factors can now cause temporal shifts in this “planning” – light is needed to synchronise the internal clock again. Dynamic lighting at the workplace can help achieve increased alertness even when “contrary to planning”. Subsequently, dimmed light towards the end of the day promotes sleep.
Irregular changes in the natural day-night rhythm can cause difficulties to sleep and lead over time to health problems. However, by adjusting the natural lighting cycle, it is possible to synchronise this shift in the day-night rhythm: Human Centric Lighting (HCL) recreates the natural daylight sequence and optimises the working environment.