The High Court had earlier banned any activity during night time.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/bombay-high-court-takes-mmrcl-task-over-night-time-works-metro-3
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/daily-news-analysis-mumbai
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/maharashtra
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/noise-pollution
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/mumbai
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/metro
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environmental-health
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/halth-effects
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/high-court
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment