The phrase "it affected my wake up time" is mostly clear and understandable, but there are a couple of improvements you could consider for clarity and consistency:
1. **Hyphenation**: "wake up" can be hyphenated as "wake-up" when used as a noun. The corrected phrase would be: "it affected my wake-up time."
2. **Context**: Depending on the context, you might want to specify what "it" refers to for clearer communication.
So, a more polished