"It was a pretty complete list," reflects a sense of thoroughness, possibly a to-do or mental list that the author has compiled. The phrase suggests the list was extensive and detailed, filling the mind with numerous points or tasks.
The quote describes the chaotic nature of the writer's thoughts, comparing them to "a bunch of sparrows on crack" which emphasizes their restless, frenetic energy. This vivid imagery illustrates how difficult it is to relax or fall asleep when one's mind is overwhelmed with swirling ideas or concerns.