᯽jealousy of one; boon of another᯽

Because Indra was envious of Kumbhakarna, he received the blessing of sleep;

Kumbhakarna was Ravana's younger brother, who had a huge body and was a gourmet. According to the Ramayana, Kumbhakarna slept for six months in a row.
For six months he would get up once a day, eat and then sleep again.
Do you know why Kumbhakarna was behaving this way?
When he was performing a Yagya, Brahma appeared in front of him and asked him to make a wish.
After hearing this Indra, fearful that he might ask for his position asked Saraswati for assistance.
Saraswati sat on Kumbhakarna's tongue, and as he told him about his wish Kumbhakarna said, 'Nindrasan' (Sleep) instead of indrasan. (throne/position of Indra)