IB Biology C3.1.11 Melatonin & sleep
IB Biology C3.1.11 Melatonin & sleep

IB Biology syllabusBiology SL/HLFirst assessment 2025
Practise using melatonin evidence to explain sleep timing, circadian rhythm disruption, pineal gland secretion and graph-based light effects.
How this is tested
- identify the pineal gland as the site of melatonin production
- interpret graphs showing how light can delay melatonin production at bedtime
- deduce suitable melatonin timing for jet lag using local evening rhythm evidence
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