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          <td class="memname">sint8 wifi_fpm_do_sleep </td>
          <td>(</td>
          <td class="paramtype">uint32&#160;</td>
          <td class="paramname"><em>sleep_time_in_us</em></td><td>)</td>
          <td></td>
        </tr>
      </table>
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<p>Force ESP8266 enter sleep mode, and it will wake up automatically when time out. </p>
<dl class="section attention"><dt>Attention</dt><dd>1. This API can only be called when force sleep function is enabled, after callin