sleeping draught

This bed is as good as a sleeping-draught; the plank in the prison was quite a different thing.

Lechworthy would be distracted, and a sleeping-draught might be necessary—and a mistake might occur.

Compared with that, dice are an opiate, and wine is a sleeping-draught.'

That night the Prince, impatient to forget the face of Truitonne, called for his sleeping-draught.