To Enable the App go to
Settings > Display > Daydream
if you want to enable the app on every Charge click on daydream Settings
More > Select when to daydream > Both
SysDream shows infos about
Time - Date
System Uptime
Battery Charge Status
Battery Temp
CPU
-total Usage
NETWORK
Current Downstream
Current Upstream
in Bit/s,KBit/s,MBit/s,GBit/s
RAM
Shows RAM Used Ram and Free
SDCard
Shows Used and Free
System
Shows Used and Free
Temperatures
CPU
Battery
All Infos in Realtime