Frontiers | Human Physiology During Exposure to the Cave Environment: A Systematic Review With Implications for Aerospace Medicine
Biological Rhythms These are patterns of activity in animals and plants Circadian (24 hours) Infradian (more than 24 hours) Ultradian (less than 24 hours) - ppt download
Sleep/wake cycle of Michel Siffre in a deep, lightless cave for 62... | Download Scientific Diagram
SYND 7-9-72 SCIENTIST MICHEL SIFFRE EMERGES FROM CAVE AFTER FIVE MONTHS - YouTube
Volunteers spent 40 days in a cave with no natural light or clocks, and most want to go back. Here's why… - BBC Science Focus Magazine