Sleep is essential for health, safety and productivity. Lack of sleep has increased in recent decades and is associated with numerous health issues. Normal sleep involves NREM and REM cycles that regulate functions like temperature and hormones. Sleep deprivation impairs the immune system, increases health risks, and causes mood changes, reduced cognitive function and weight gain. It is estimated to cost the Australian economy billions annually in accidents, lost productivity and healthcare. Employers should promote sleep health through education, shiftwork policies, monitoring and encouraging good sleep hygiene habits.