We don’t sleep the same way every night,
so a single snapshot of your sleep may miss important information.
If you were trying a program such as weight loss or side-sleeping,
you could track improvements in your sleep patterns.
If you decided to keep a regular schedule and make other changes in your bedtime routine,
you could track your improvement in sleep efficiency and continuity.
If your health status changed or you were started on new medications,
you could monitor yourself for changes in sleep patterns.