Mark 14:40

And when he returned, he found them asleep again
Notwithstanding the expostulation he had used with them, the exhortation he had given them, and the danger he had suggested to them:

for their eyes were heavy:
with sleep and sorrow:

neither wist they what to answer him;
partly through confusion and shame, not knowing how to excuse themselves; and partly, through their being stupefied with sleep and grief.