Our body clocks vary markedly in their response to light before bedtime, with some likely to have their slumber disturbed even by very dim illumination
Source:
https://www.newscientist.com/article/2204572-even-dim-candlelight-before-bed-is-bright-enough-to-disrupt-sleep/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home