чтобы, придя внезапно, не нашёл вас спящими.
Lest coming suddenly he find you sleeping.
in case he should come suddenly and find you asleep.
lest he come suddenly and find you asleep.
If he comes suddenly, do not let him find you sleeping.
lest, coming suddenly, he find you sleeping.
Don’t let him find you sleeping when he arrives without warning.
lest coming suddenly he find you sleeping.