code: async def _continueAfterSleep(self, seconds):
          
          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
docs: 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