The quality, timing and length of sleep are dependent upon an interaction between two biological systems in our brain, circadian rhythms and the sleep homeostat. The two systems are ‘creatures of habit’ and like to work with regular schedules. Most of us don't have a regular sleep routine, though. We mix early starts, late nights and weekend lie-ins. We travel across time zones, teenagers stay out late and many of us spend lots of time indoors where there is insufficient light. When these systems get out of sync, we can suffer insomnia, sleep phase disorders and other problems like poor quality sleep, waking too early or struggling to wake up altogether.

Following a regular sleep schedule trains your brain to recognise when it’s time to sleep and when it’s time to wake. Light is able to synchronise the inner body clock and help stimulate the brain cells to produce sleep or wakefulness hormones at the right time. Lumie invented Bodyclock wake-up lights to give a bright sunrise signal in the morning, helping people who struggle to get to sleep at night by setting the body’s natural rhythms earlier.