I've also heard other complaints about people who do this to constantly stream SIC messages even when they're not active. While I do not think this is necessarily game-breaking, it certainly is a grey area in terms of abuse and meta.
I propose that if your PC doesn't get 6-8 hours of sleep (logoff time) daily, they begin to experience a sleep deprivation $cript. Impacts would be subtle at first with reduced fatigue and perception but slowly amplify. Ways to combat this would be with drugs and the appropriate chrome object.