Psychology 0.0 / 5 ? PsychologySleepA2/A-levelAQA Created by: faith_17Created on: 10-03-16 10:32 24315 Across 1. a hormone secreted in ressponse to light (9) 5. internal rhythm (10, 9) Down 2. external time giver (9, 9) 3. Siffre spent this amount of time in a cave (5) 4. Rhythm that occurs once every 24 hours (9)
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