Sony has announced it's taking PSN down for six hours on Monday January 27 to perform mandatory maintenance.
In the Middle East, the maintenance will take place between 9:30pm and 3:30am.
If you've signed into the PlayStation Network any time since January 20, you'll be able to play games online and access apps like Netflix without issues (or the IGN app, since nothing else is available here). The PS Store, PlayStation Home and Account Management won't be available though.
In other words, make sure you sign into PSN this weekend if you're looking to get some online gaming done on Monday!