Data
182,066 items of data are available, covering 182,066 participants, encoded using Data-Coding 
2554.
 
Notes
Sleep online question: "During the past month, how often have you had trouble sleeping because: you have to get up to use the bathroom?" 
The question in this field was taken from the Pittsburgh Sleep Quality Index. 
Buysse D J, Reynolds CF, Monk TH, Berman SR, Kupfer DJ. The Pittsburgh Sleep Quality Index: A new instrument for psychiatric practice and research. Psychiatry Research 1989 May;28(2):193-213.