Some people (myself included) fix (sleep) hygiene problems by first closely watching and diagnosing them. Your comment would sound silly if it said "last thing

Some people (myself included) fix (sleep) hygiene problems by first closely watching and diagnosing them. Your comment would sound silly if it said "last thing you need for good code is a debugger, I'd try to add a linter first". Or "last thing you need to maintain a good weight is a scale, I'd try to eat better first". Neither are exclusive, and the former helps the latter if you use it well.