Some people tend to be on a short fuse right after they get out of bed, generally lasts about an hour. Usually caused by insufficient sleep. Example: "My boss has bad 起床气, so I don't schedule meetings with him early in the morning." Can also be used to refer to the inexplicable resentment you hold towards the person who woke you up. Even if you told them to wake you up, you still have 起床气 towards them. It usually goes away later in the morning, once you're fully awake.