Sometimes he gets in fights with the dark. Sometimes while he's sleeping. Sometimes, he only has a spray bottle. You see, he is desperately afraid of the dark because it reminds him of being alone - something he is not fond of at all. When he encounters dark spaces he gets very jumpy. He also does not like loud noises, dirty places, anyone touching him, or cheese. Eventually, he read Katie Gibbons' diary, and while it had a profound impact on him intellectually, it didn't really help him get ahead in the force.