Fellow Rockbox hackers, I'd like to commit FS#10849, which introduces two new features for the sleep timer: The sleep duration is now a setting, so it's persistent across reboots and doesn't have to be set each time the sleep timer is used; and an option to engage the sleep timer on each boot. This patch has been constantly rebased and improved over the last two years and has quite a few users. I think it's mainly useful for DAPs used as bedroom alarm clocks, but the persistent timer value is of help for all sleep-timer users.
With the recent settings cleanup I think it is now a commit candidate. Please let me know if you have any concerns. Flyspray has two more patches based on this one which extend the sleep timer with even more features: FS#10754 and FS#11042. These extensions can be considered once this patch is in. Cheers, sideral