RT Journal Article SR Electronic T1 Simplified sleep restriction impacts objective but not subjective sleep for people with primary insomnia in primary care JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 206 OP 206 DO 10.1136/ebmed-2015-110290 VO 20 IS 6 A1 Jason Ellis YR 2015 UL http://ebm.bmj.com/content/20/6/206.abstract AB