Those are valid points. Here would be my simple approach (tell me if you think it doesn't make sense or needs some adjustments):
Short, occasional check-ins: The app could nudge you (maybe just once in the morning, afternoon, and evening for a week) to rate how you’re feeling, with a tap or two — think 2 seconds, not 2 minutes.
Learn from your habits: After this “trial week,” the app would look for patterns. For example, if you usually feel sharp at 10am, that gets noted. No need to keep checking in all the time.
Short, occasional check-ins: The app could nudge you (maybe just once in the morning, afternoon, and evening for a week) to rate how you’re feeling, with a tap or two — think 2 seconds, not 2 minutes.
Learn from your habits: After this “trial week,” the app would look for patterns. For example, if you usually feel sharp at 10am, that gets noted. No need to keep checking in all the time.