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Kumbhakarna undertook a penance to get the blessings of Lord Brahma. Brahma was pleased with Kumbhakarna and offered him a boon. But that time Saraswati tied his tongue firmly.So instead of asking for Indraasan (seat of Indra) Kumbhakarna uttered Nindraasan (bed for sleep). Brahma granted his request. Ravana realized that the boon was a curse in reality and so he asked Brahma to undo his boon.
Thus Brahma decided that Kumbhakarna would sleep for six months at a stretch and remain awake for another six consecutive months. SIX MONTHS SLEEP APNEA!!!