Sony Computer Entertainment just announced on its official forums that the PlayStation Network will undergo a maintenance on Thursday 12th February from 5 PM until 8:30 PM GMT, translating to 12 PM until 3:30 PM EST.
For the duration of the maintenance you will be unable to login to Account Management and the PS Store. PS Home will also be unavailable.
PS4 users will be able to access online gameplay only if their system is activated as their Primary system and they have recently signed into their SEN account and have their authentication details cached. If your PS4 system is not activated as the Primary system, online gaming may not be available.
PS3 and PS Vita users may experience limited PSN functionality, however online gameplay will be available to users who have recently signed into their SEN account and have their authentication details cached.
Users who do not have their details cached, will not be able to sign-in to their account or begin an online gaming session.
There may be some additional downtime after the maintenance period for testing purposes.
Time to make sure you log in before the maintenance if you want to keep playing.