midnight
`` Yes . '' `` Aspen will be corporal in charge of quarters to-night . Hartley is sometimes a very slovenly soldier , '' Kelly reported . `` May I direct Corporal Aspen to keep Hartley up and give the instruction in saluting after midnight ? Corporal Aspen could take the man into the mess-room where none of the men would be disturbed . '' `` That sounds like a good idea , '' Dick nodded , smiling slightly . `` If he has to lose some of his sleep for instruction Hartley may remember better .