Variations in circadian rhythms of activity, sleep, and light exposure related to dementia in nursing-home patients
Journal article published in 1997 by
S. Ancoli-Israel,
M. R. Klauber,
D. W. Jones,
D. F. Kripke,
J. Martin,
W. Mason,
R. Pat-Horenczyk 
,
R. Fell
,
R. Fell
