midnight
When Mary stood in the corridor , while the beds were being made , she saw them turning this wheel , and wondered what the game could be . They had a folding board with yellow numbers on a dark green ground , and they were playing with ivory chips of different colours . Mary had the lower berth , but when she realized how much pleasanter it would be to sleep in the upper one , she could not bring herself to take it . She felt that it would be selfish to be found there when Miss Wardropp came to undress ; and when the latter did appear , toward midnight , it was to see the lower berth left free . `` Why , but you were below . Did n't you know that ? '' she inquired rather sharply , as if she expected her room mate to insist on changing .