Mbh 7.184.2b

[243] While they were being thus slain and mangled by one another, and while sleep sat heavy on their eyes, it became midnight. All the Kshatriyas became cheerless. Thy troops, as also those of the foe, had no more weapons and arrows. Passing the time thus (most of), the warriors (of both armies) endued with modesty and energy and observant of the duties of their order, did not abandon their divisions. Others, blind with sleep, abandoning their weapons, laid themselves down. Some laid themselves down on the backs of elephants, some on cars, and some on horseback, O Bharata! Blind with sleep, they became perfectly motionless, O king. Other warriors (that were yet awake) in that battle, despatched these to Yama’s abode. Others, deprived of their senses, and dreaming in sleep, slew themselves, that is, their own comrades, as also foes. Indeed, these fought in that dreadful battle, uttering various exclamations. Many warriors, O monarch, of our army, desirous of continuing the fight with the foe, stood with eyes drowsy with sleep. Some brave warriors, during that terrible hour of darkness, though blind with sleep, yet gliding along the field, slew one another in that battle. Many amongst the foe, entirely stupefied by slumber, were slain without their being conscious (of the strokes that launched them into eternity). Beholding this condition of the soldiers, O bull among men, Vibhatsu in a very loud voice, said these words: “all of you, with your animals, are worn out with exertion and blind with sleep. Ye warriors, ye are enveloped in darkness and with dust. Therefore, if ye like, ye may rest. Indeed, here, on the field of battle close your eyes for a while. Then when the moon will rise, ye Kurus and Pandavas, ye may again, having slept and taken rest, encounter each other for the sake of heaven.”