A number of studies have attempted to objectify the measurement of sleep quality in TBI rehabilitation by having nursing staff keep an overnight log to document whether the patient was asleep or awake at hourly intervals (Burke, Shah, Schneider, Ahangar, & Al Aladai, 2004; Worthington & Melia, 2006). Because this results in only one single observation point per hour, it misses the nuances of the sleep/wake cycle obtained through more continuous measurement throughout the night and is still somewhat subjective and dependent on the observer's judgment.