有人知道/sys/power/wakeup_count节点的作用吗，求解析

铸道的汉子

按照官网的说法：

What:                /sys/power/wakeup_count
Date:                July 2010
Contact:        Rafael J. Wysocki <rjw@sisk.pl>
Description:
                The /sys/power/wakeup_count file allows user space to put the
                system into a sleep state while taking into account the
                concurrent arrival of wakeup events.  Reading from it returns
                the current number of registered wakeup events and it blocks if
                some wakeup events are being processed at the time the file is
                read from.  Writing to it will only succeed if the current
                number of wakeup events is equal to the written value and, if
                successful, will make the kernel abort a subsequent transition
                to a sleep state if any wakeup events are reported after the
                write has returned.

求解什么是wakeup events，