Caffeine and Sleep

Person,Caffeine,Sleep
A,No,8.0
A,No,8.5
A,No,9.0
A,No,10.0
A,No,9.5
A,No,9.0
A,No,8.0
A,No,10.0
A,No,9.5
A,No,10.0
B,No,9.0
B,No,8.0
B,No,8.0
B,No,9.0
B,No,8.5
B,No,10.0
B,No,8.5
B,No,9.5
B,No,9.0
B,No,10.0
A,Yes,6.0
A,Yes,5.5
A,Yes,6.0
A,Yes,7.0
A,Yes,7.5
A,Yes,5.5
A,Yes,7.0
A,Yes,7.0
A,Yes,7.5
A,Yes,8.0
B,Yes,6.5
B,Yes,6.0
B,Yes,6.0
B,Yes,6.5
B,Yes,7.5
B,Yes,6.0
B,Yes,6.5
B,Yes,7.5
B,Yes,7.0
B,Yes,9.0