Terms for subject Idiomatic containing in the night

English	Russian
dog in the night-time	ничего не подозревающий соучастник преступления (an unsuspecting conniver; see the Sherlock Holmes adventure "Silver Blaze" published by Sir Arthur Conan Doyle in 1892 Bullfinch)
in the dead of night	посреди ночи (markovka)
in the dead of night	под покровом ночи (Someone was sneaking around in the dead of night. Wakeful dormouse)
in the middle of the night	глухой ночью (глубокой ночью Alex_Odeychuk)
in the middle of the night	глубокой ночью (Tanya Gesse)
Like ships that pass in the night	как в море корабли (stonedhamlet)