What’s on the The Body Clock poster
A definition and 6 facts worth remembering.
An internal roughly-24-hour cycle governing sleep, temperature, hormones and alertness, reset each day chiefly by light reaching the eyes.
- Free-running, the human clock is slightly longer than 24 hours.
- Morning light advances it — you become sleepy earlier.
- Evening light delays it — you become sleepy later.
- Melatonin rises about two hours before habitual sleep.
- Core body temperature bottoms out roughly two hours before waking.
- Chronotype is largely genetic and shifts with age.
- Cycle — ~24.2 h
- Outdoor light — 10,000+ lux
- Indoors — ~300 lux
- Ten minutes outdoors in the morning delivers more clock-setting light than a whole da…
Jet lag is the clock disagreeing with local time. Roughly one day of adjustment per time zone crossed.
Questions about the The Body Clock poster
- What’s on the The Body Clock poster?
- A definition and 6 facts worth remembering. An internal roughly-24-hour cycle governing sleep, temperature, hormones and alertness, reset each day chiefly by light reaching the eyes. Free-running, the human clock is slightly longer than 24 hours.; Morning light advances it — you become sleepy earlier.; Evening light delays it — you become sleepy later.; Melatonin rises about two hours before habitual sleep.; Core body temperature bottoms out roughly two hours before waking.; Chronotype is largely genetic and shifts with age.; Cycle — ~24.2 h; Outdoor light — 10,000+ lux; Indoors — ~300 lux; Ten minutes outdoors in the morning delivers more clock-setting light than a whole da…. Jet lag is the clock disagreeing with local time. Roughly one day of adjustment per time zone crossed.
- Who is the The Body Clock poster for?
- The Body Clock belongs to the Body & health section rather than to a school year, because health is not something one grade owns. Anyone learning sleep & mind can pin it up — a beginner, a student mid-course, or someone revising years later.
- When should you use the The Body Clock poster?
- Light in the morning advances the clock; light at night delays it. Timing is the lever. A wall chart earns its place by being glanceable from where the work is happening, so The Body Clock belongs on the wall where that health work actually happens, within glancing distance, rather than filed away.
- What other posters go with The Body Clock?
- Attention, Breathing Techniques and Burnout sit alongside The Body Clock in the Body & health section. Printed together they make a wall rather than a single sheet, which is how a reference set actually gets used.AttentionBreathing TechniquesBurnout
- Is the The Body Clock poster free to download and print?
- Yes. The Body Clock downloads as a free PDF with no account, no email and no watermark, like everything else in the Body & health section. Print as many copies as you like for a home, a classroom, a library or a tutoring group; reselling the file is the only thing the licence rules out.Read the licence
- What size does the The Body Clock poster print at?
- The Body Clock is a vector PDF laid out for US Letter, and prints on A4 with Fit to page — the same file, no separate download. Because every mark on it is drawn rather than photographed, it stays sharp enlarged to A3, A2 or A1 at a copy shop. Colour carries emphasis only, so a greyscale print of The Body Clock loses nothing.Printing guide
Related posters
Charts that sit alongside The Body Clock on the same wall.
Browse every Body & health poster, or start from the full catalogue.