MBA 11" Not going into sleep mode, ever

[AishasStar]

Hey guys
Long time listener - first time caller.
I have searched extensively for my issue and never found anything that is the same.

My MBA has started to fully drain the battery when I close the lid over night, it will also drain fully if I leave the lid open, the display shuts off - so it looks like its sleeping. But after 4-5 hours without being plugged in it will go from having 100% battery to 0%.

I have to manually select Sleep from the Apple menu to get the MBA to keep its charge over night.

I have not updated or changed anything other then the standard auto updates.

I dont really know much about computers or Mac's so Ill just copy in the info that looks like it should mean something to me..

Version 10.6.8

System Power Settings:
AC Power:
System Sleep Timer (Minutes): 0
Disk Sleep Timer (Minutes): 0
Display Sleep Timer (Minutes): 0
Wake on AC Change: No
Wake on Clamshell Open: Yes
Wake on LAN: Yes
Current Power Source: Yes
Display Sleep Uses Dim: Yes
Standby Delay: 4200
Standby Enabled: 1
Battery Power:
System Sleep Timer (Minutes): 10
Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 2
Wake on AC Change: No
Wake on Clamshell Open: Yes
Display Sleep Uses Dim: Yes
Reduce Brightness: Yes
Standby Delay: 4200
Standby Enabled: 1

TIA!

[AishasStar]

BUMP

Anyone got any ideas???

[robvas]

You may have a program running that keeps the Mac awake.