Table 4 Correlations between sleep variables (*p < 0.05, **p < 0.01).

From: Daytime nap controls toddlers’ nighttime sleep

Sleep variables

Nap duration

Nap end time

r

p

r

p

Bedtime

0.38

0.006**

0.52

0.000**

Sleep onset time

0.37

0.008**

0.52

0.000**

Wake time

−0.06

0.662

0.37

0.007**

Sleep latency

0.02

0.905

0.08

0.576

Nighttime sleep duration

−0.57

0.000**

−0.31

0.028*

Nap duration

–

–

0.36

0.011*

Total sleep duration

0.21

0.141

−0.051

0.727

Nap end time

0.36

0.011*

–

–

Sleep efficiency

0.06

0.661

−0.15

0.284

WASO (wake after sleep outset)

−0.15

0.314

0.11

0.453

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