Sleep Guidelines Chart
Figure 1: Optimal sleep guidelines, indicating per age group age-appropriate bedtimes, and wake-up times, as well as number of hours sleep per night (right). Note that dark shading implicates sleep times, and the lighter colors in the youngest (3-4 yrs) and oldest (>50 yrs.) age groups indicate exchangeable times, i.e. when someone naps during the day, sleep pressure in the early evening is probably lower. For the >50 yrs. age group the lighter colors further indicate higher occurrences of fragmented sleep that are normal at those ages.
These guidelines were derived from various sources.