If you’re stirred from the deepest stages of slow-wave sleep, “you might have no idea where or who you are,” Duffy says. In that case, it might help to snooze some minutes more. That way you can reawaken from a different stage of sleep, such as REM, when your body is closest to its wakeful state. “It might make things better,” says Duffy. But if you’re in REM already, snoozing could send you deeper and make things worse.