Remote computer not running send keystrokes or mousemove

I have a computer in another location, unattended (windows 7). The only way that computer is accessed is through Remote Desktop Connection.

I setup a code on that computer which runs flawlessly when I am connected remotely.

#include <IE.au3>
;open IE
Local $oIE = _IECreate("https://fake-site.com",0,1,0)
sleep (5000)
;input login information
Send ("username")
send ("{TAB}")
send("password")
send ("{ENTER}")
Sleep(1000)
; more code here including mousemove

I exit the remote - not log out, just close the connection. The computer is still logged on with the same user, but not sure in what state it acctually remains - that causes the code not to execute completely.

The code is scheduled to run at certain time during the night.

All it does is it opens the web site, but doesn't input user and password... or anythingelse.

I suspect it's because monitor turns off during the night ?!?!?!

And if this is the problem, is there a way around it? (w/o changing power options on the computer - don't have admin rights)