'Release the Dogs' - Season 4, Episode 8
Alan suffers from insomnia. He visits his psychiatrist, who reveals that the cause of Alan's sleepless nights is his jealousy towards Charlie, and his inability to glide through life.
Air Date: November 12th 2006.
Jake: (To Charlie). You'll hit on anything with a pulse!
Charlie: No kids in my house.
Jake: I'm a kid.
Charlie: I don't think of you as a kid. I think of you as more of a gassy dwarf.