It's not a stickied thread but here is where we've been discussing it.
http://www.disboards.com/threads/the-ongoing-monorail-closure-schedule.3511902/
Typically the schedule has been on Sunday and Monday nights the beams shut down at the following times regardless of when the park close. Resort 12am Express 11:30pm and Epcot 11pm. The following mornings the beams will open at these times. Resort 8:30am Epcot 9am and Express 9:30am.
On Tuesdays, Wednessdays and Thursdays the Express beam will close midday from 11:30am to 6pm, other beams will operate as normal.
During times of the monorail down times other forms of transportation will be available. Whether it be Bus or Boat where applicable.