Don’t panic if you’re just signing in to find the PlayStation Network offline – Sony has revised the times of its previously announced scheduled maintenance, bringing it forward to 13:00PM GMT. The construction period will run until 03:00AM GMT tomorrow, but you may still be able to login in the meantime. Account Management, Account Registration, and the PlayStation Store will definitely be unavailable during the window, though.
Don’t worry about your Trophies, as they will be stored and synced the next time that you sign in. If you’re having any additional problems, remember to refer to the official PlayStation website for up-to-the-minute information and contact details.