about 10 p.m.
One or two were even snoring slightly . Mademoiselle heaved a sigh of relief , and went off thankfully to her own bedroom to write letters . She did not consider it necessary to interrupt herself at this occupation . Miss Gibbs had indeed urged the expediency of a surprise visit at about 10 p.m. , but Mademoiselle had no vocation for enforcing discipline , and was not over-burdened with conscientious scruples . Moreover , she considered that , if her Principal took an evening off , she might be licensed to do the same . The conspirators had decided not to begin the celebrations too early . With heroic self-restraint they remained quietly in bed until 10.30 .