Different parts of the pattern
Deep sleep is commonly used to describe the deepest non-REM stage, while REM is a distinct stage that recurs through the night. Both are normal parts of sleep architecture.
Avoid score anxiety
Consumer trackers estimate sleep stages from indirect signals. Their labels can be interesting prompts for reflection, but they are not a medical assessment and should not become a reason to force a routine that is otherwise working.
A better question
Instead of asking how to maximize one stage, ask whether you have enough time and consistency to sleep. Daytime functioning and sustained habits are more useful context than one dashboard.
