Orangutan Night-Time Long Call Behavior: Sleep Quality Costs Associated with Vocalizations in Captive Pongo

Table 2

Spearman’s rho correlation showing the significant relationship between the number of nightly long calls () and measures of sleep quality: arousability (number of motor activity bouts per hour), sleep fragmentation (the number of brief awakenings greater than 2 min per hour), sleep quality (sleep duration/time in bed), and total sleep time (mins).

	Arousability		Sleep fragmentation		Sleep quality		Total sleep time
Number of nightly long calls