In my case I wanted to kill sleep altogether.

c:\windows\system32\powercfg.exe -change -monitor-timeout-ac 0 c:\windows\system32\powercfg.exe -change -monitor-timeout-dc 0 c:\windows\system32\powercfg.exe -change -disk-timeout-ac 0 c:\windows\system32\powercfg.exe -change -disk-timeout-dc 0 c:\windows\system32\powercfg.exe -change -standby-timeout-ac 0 c:\windows\system32\powercfg.exe -change -standby-timeout-dc 0 c:\windows\system32\powercfg.exe -change -hibernate-timeout-ac 0 c:\windows\system32\powercfg.exe -change -hibernate-timeout-dc 0