You have either a hardware issue (lid sensor), an SMC issue (try an SMC reset, it's painless), or software you run is preventing sleep (which you can find by lo

You have either a hardware issue (lid sensor), an SMC issue (try an SMC reset, it's painless), or software you run is preventing sleep (which you can find by looking in the Energy tab of Activity Monitor. Google search for "os x sleep prevented") or you have some hardware plugged in (external displays and keyboards can sometimes prevent a lid-shut from triggering sleep; I forget the 'rules' around this.) Also, you can set the power manager's hibernatemode to your liking (Google search "os x hibernate mode") but there usually no reason to adjust the default (sleep for 3-4 hours, then suspend to disk) given how fast storage is in macs these days. Macs have been famous for decades for having the best sleep/hibernate functions in the industry and when yours didn't work properly maybe you should have investigated? Or at least not be whinging about Apple over it?