$ pmset -g assertions 2012/08/24 7:43:00 JST Assertion status system-wide: PreventUserIdleDisplaySleep 0 PreventSystemSleep 1 PreventUserIdleSystemSleep 0 ExternalMedia 0 UserIsActive 0 ApplePushServiceTask 0 BackgroundTask 1 Listed by owning process: pid 57744(InternetSharing): [0x0000000800001ffb] 08:17:26 DenySystemSleep named: "com.apple.InternetSharing" pid 66253(named): [0x000000080000200f]