Sunan Abi Dawud Book 5, Hadith 77

A man asked the Messenger of Allah (ﷺ) about the prayer at night. The Messenger of Allah (ﷺ) said: Prayer during the night should consist of pairs of rak'ahs, but if one of you fears the morning is near he should pray one rak'ah which will make his prayer an odd number for him.

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The Prophet (ﷺ) was asked: which is the best action? He replied: To stand in prayer for a long time.

Sunan Abi Dawud Book 5, Hadith 76
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The Prophet's (ﷺ) recitation was loud enough for one who was in the inner chamber to hear it when he was in the house.

Sunan Abi Dawud Book 5, Hadith 78