For some sleep comes easy, for others it's a constant struggle.
The issues, problems and disorders many people suffer preventing them from getting some shut eye is being discussed at an annual sleep conference in Auckland this week.
One of the research papers being presented is a study that's found women are better in bed, sleep-wise at least.
Lead researcher Dr Kathleen Maddison, from the University of Western Australia, explains why women sleep better and longer than men.