Does the iPad Night Shift mode reduce melatonin suppression?

R. Nagare, B. Plitnick, M. G. Figueiro

Research output: Contribution to journalArticlepeer-review

40 Scopus citations


The increased use of self-luminous displays, especially in the evening prior to bedtime, has been associated with melatonin suppression, delayed sleep and sleep curtailment. The present study set out to investigate whether the Night Shift application provided by Apple Inc. for use on its portable electronic devices is effective for reducing acute melatonin suppression, a well-established marker of circadian phase. Participants experienced four experimental conditions: a dim light control, a high circadian stimulus true positive intervention and two Night Shift interventions delivering low and high correlated colour temperature light from the devices. Melatonin suppression did not significantly differ between the two Night Shift interventions, which indicates that changing the spectral composition of self-luminous displays without changing their brightness settings may be insufficient for preventing impacts on melatonin suppression.

Original languageEnglish
Pages (from-to)373-383
Number of pages11
JournalLighting Research and Technology
Issue number3
StatePublished - 1 May 2019
Externally publishedYes


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