Closer friends have more similar actigraphy-estimated sleep patterns.

Friend-pair differences in students’ median sleep timing tended to be smaller for close versus casual friendship groups, but did not reach statistical significance for sleep onset (mean difference = −0.36 h, 95% CI = −0.72 to 0.04 h; Cohen’s d = −0.30, 95% CI = −0.65 to 0.04; p = .076) ( Table 2 and Figure 3 A ) or sleep offset (mean difference = −0.36 h, 95% CI = −0.78 to 0.02 h; Cohen’s d = −0.29, 95% CI = −0.61 to 0.03; p = .084) ( Table 2 , Figure 3 B ).

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