Figure

awake (bpm)

sleep (bpm)

$\overline{x}$

σ

$\overline{x}$

σ

2(a1)

74

7.0

52

2.9

2(a2)

78

8.2

57

4.0

2(b1)

85

7.0

60

3.7

2(b2)

81

7.2

61

4.4