# A problem about sleep mode.

**URL:** <https://forums.digi.com/t/a-problem-about-sleep-mode/789>\
**Category:** XBee - Zigbee\
**Created:** [November 17, 2011, 7:53am UTC](https://forums.digi.com/t/a-problem-about-sleep-mode/789 "2011-11-17T07:53:08Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![ZHQ](https://avatars.discourse-cdn.com/v4/letter/z/ecd19e/32.png) [@ZHQ](https://forums.digi.com/u/ZHQ)\
**Post date:** [November 17, 2011, 7:53am UTC](https://forums.digi.com/t/a-problem-about-sleep-mode/789/1 "2011-11-17T07:53:08Z")

</div>

I am using the Xbee pro S2B module, I can make it sleep and wake up successfully as I want ,but the problem is every time it wakes up then sends data,the receiver can receive nothing. I don’t know exactuly why. Who can help me?  
Thanks very much.