Can a man sleep in the same room as his sister?

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Check below answers in case you are looking for other related questions:
Ruling on differentiating between children in gift-giving
Singling Out One Child to Sleep in a Room Alone - Fair or Not?

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Related Answers:
Renewing wudoo’ before going to sleep
Commentary on the hadith of Ibn ‘Umar, “Whoever says following every prayer and when he goes to bed, ‘Allahu akbar ‘adad ash-shaf‘i wa’l-witr…’”
Guidelines of the Prophet (peace and blessings of Allaah be upon him) concerning sleep
Ruling on differentiating between children in gift-giving
Singling Out One Child to Sleep in a Room Alone - Fair or Not?

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