Do you need help from the Reference Librarians during the extended hours?
Make an appointment with them and don't be disappointed! 
During the Extended Hours all the Library Staff will work in shifts to keep the Library open until 2am. Also the Reference Librarians' shifts might change and if you need to ask for help, make sure you set up an appointment with them when they are available.
Appointments can be booked online at http://johncabot.libcal.com/appointments/
For quick help, you can always find a librarian at the Welcome Desk!