Definition of daytime and nighttime Daytime and nighttime intervals are best defined using sleeping time reported by individual users' diary cards (awake and asleep periods) Fixed‐narrow time intervals may be applied by discarding transition periods between daytime and nighttime (eg, daytime defined as 0900‐2100 h and nighttime defined as 0100‐0600 h), provided that there is no daytime sleep (siesta) during ABPM Editing and requirements Editing is not necessary for calculating average 24‐h, daytime, and nighttime values The ABPM should be repeated if the following criteria are not met 24‐h recording with at least 70% of expected measurements At least 20 valid awake and 7 valid asleep measurements At least 2 valid daytime and 1 valid nighttime measurements per hour for research purposes