The PlayStation Network will be undergoing some downtime due to maintenance tomorrow, Monday, December 3. The service will be down for 8 hours from 8AM to 4PM Pacific Time (11AM to 7PM Eastern). If you feel like you absolutely need to play online in that time, Sony is advising that you sign up now and keep online until it’s over.”If you’ve signed onto PSN over the past few days, you’ll still be able to play online and access apps during this period, but you may receive a maintenance notification when attempting to access the PlayStation Store, PlayStation Home, and Account Management as these services will be unavailable. Be sure to sign in now if you wish to access the Network during this maintenance window.
Thanks for your patience during this maintenance timeframe, and we apologize for any inconvenience this may cause.”
Article from Gamersyndrome.com