Date	Event	Description
6 February 2017	Amended	Added external source of support
27 July 2016	New citation required but conclusions have not changed	Results from the additional included study strengthen our findings that CL shortens length of hospital stay compared with CBL. The quality of the evidence according to GRADE was low for this outcome
16 March 2016	New search has been performed	This updates the review "Cycled light in the intensive care unit for preterm and low birth weight infants" (Morag 2013). Through searches run on January 12, 2016, we identified for inclusion 1 new study (Vásquez‐Ruiz 2014), which enrolled 38 infants
3 June 2013	New citation required but conclusions have not changed	We identified 1 additional trial, which enrolled 37 infants. This study compared cycled light versus near darkness and reported a significant reduction in length of hospital stay. Results for length of stay should be interpreted with caution as the outcome is highly dependent on the PMA of the neonate at birth, the availability of institutions providing Level II care to which the neonate can be transferred and the social situation of the family. The same study found a significant reduction in time spent crying over 24 hours at 11 weeks' corrected age. The new findings support the use of CL, but the evidence is not strong enough for us to change our conclusions as provided in the previous update: "Although the results of this review favour the use of CL versus ND and CL versus CBL, the studies published to date preclude a clear recommendation because of a lack of power. Cycled light appears preferable to CBL"
29 October 2008	Amended	We prepared this review update according to the new review format