(sleep-until
	(default (arg CLOCK_OR_TIME) (files -0) (suggest clock)
		 (desc 'Select clock or exit time'))
	
	(suggestion clock (verbatim CLOCK_REALTIME
				    CLOCK_MONOTONIC
				    CLOCK_BOOTTIME
				    CLOCK_REALTIME_ALARM
				    CLOCK_BOOTTIME_ALARM))
)