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(01) Sadhguru only sleep 1-4Hrs A Day. If you do it right (sync with nature). Can same.
(02) Time/energy/inertia concept. Eat too much = body uses processing energies
(01) Logic: relax muscles down from tip of head to tip of toe. Remember neck/shoulders/hands.
(02) Cstan98: light nasal breathing + high workloads natural sleep knockout.
(01) Baidu: Monks at Temple sleep 10PM-2AM.
(02) Google Search: sleep is 1 out of 5 big sins.