返回True，可睡醒或被叫醒后继续的；否则，睡醒或被叫醒后，不能继续执行

async def _continueAfterSleep(self, seconds):
        """ 返回True，可睡醒或被叫醒后继续的；否则，睡醒或被叫醒后，不能继续执行 """
        assert self._sleeping is None
        self._sleeping = InterruptibleSleep(seconds)
        try:
            await self._sleeping.wait()
            return True
        except asyncio.CancelledError:
            return not self._is_stopping
        finally:
            self._sleeping = None