“…In the studies selected for this review, the most common instrument used for data collection was the Pittsburgh Sleep Quality Index (PSQI) in 9 studies [2-4, 6, 9, 10, 14-17, 19-22, 24, 25], followed by actigraphy in 7 studies [6,17,18,22,[25][26][27] , sleep diaries in 6 studies [6,17,18,22,[25][26][27] and general questions in 1 study [15].…”