Sleep Timer icon activation indicator
Sleep timer activation symbol is currently displayed as a diagonal line cutting through the "clock."
I may be wrong about this but a line cutting through a symbol is normally associated with negation, deselection, turning off a function.
To indicate the "clock" for the sleep timer has been activated, I would suggest an easier to interpret visual such as a line underneath the clock.
My natural reaction to seeing a line cutting through the displayed icon clock is that it has been deselected.
It would be interesting to learn how other users interpret the "diagonal line" as associated with "on" or "off."
To adjust the timer setting with less time, the user must choose "disable timer" and then reset the timer with customized time, involving easy to do steps.
Even easier, if programmable, would be to offer a "+" and "-" associated with quickly and "fine-tuning" an adjusted desired sleep timer number.