The 50-year-old-self-styled godman drank only some water during the night and took milk in the morning, the official said.
Ram Rahim did not talk with anyone and was seen roaming in the cell.
The Dera sect chief has been kept in the approval cell at Sunaria jail in Rohtak.
A special CBI court yesterday sentenced Ram Rahim Singh to 20 years in jail for rape of his two followers, holding he acted like a "wild beast" who did not even spare his own "pious" female disciples.
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