Hours of sleep needed, from infancy to young adulthood.  

age	sleep needed
(years)	(hours per day)
0.0192	16.5
0.0833	15.5
0.25	15
0.5	14.5
0.75	14
1	13.75
1.5	13.5
2	13
3	12
4	11.5
5	11
6	10.75
7	10.5
8	10.25
9	10
10	9.75
11	9.5
12	9.25
13	9.25
14	9
15	8.75
16	8.5
17	8.25
18	8.25