Hi, I'm French user so excuse my poor english.
Try this, it will disable to go to sleep :
Add to the end of file :
Best regard, Fred
Try this, it will disable to go to sleep :
sudo nano /etc/modprobe.d/8192cu.conf
Add to the end of file :
# Disable wifi sleeping options 8192cu rtw_power_mgnt=0
Best regard, Fred