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At night-time there are less sounds from traffic and people - therefore any sounds that are heard seem louder.
Night Sounds - 2006 was released on:
USA: 20 November 2006 (MassBay Film Festival)
Planes make the same sounds whether in the day time or night time.
Dark, Evil, Night
The Nurses - 1962 Night Sounds 1-17 was released on:
USA: 24 January 1963