Signposts the direct way to day versus night

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Size: 8000px × 4500px
Location:
Photo credit: © Zoonar/Thomas Reimer / Alamy / Afripics
License: Royalty Free
Model Released: No

Keywords: 24-hour, alertness, body, chronotype, circadian, clock, contrast, cycle, darkness, dawn, day, daylight, deprivation, direct, diurnal, dusk, german, insomnia, jet, lag, lark, light-dark, melatonin, morning, night, nocturnal, opposites, owl, productivity, relaxation, rest, rhythm, shift, signposts, sleep, sleep-wake, sunrise, sunset, work