You seem to have pasted the same info 2x with a blank page in-between…
But anyhow this part looks abnormal to me:
Because it shows that you laptop is waking up from sleep right after/at same time it went to sleep: Same timestamps “20:43:04”
This should never be the case…
Also imho it should have said ACPI: Low-level sleep complete instead of ACPI: Low-level resume complete, but that might have been a wrong text in that module who knows…
Most probable cause would be because those events all fired at same split second and the messages are shown interleaved with each other instead of in sequence of action.
So my conclusion is:
There is some serious problem with Power Management.
We just have to figure out if it is in software or hardware…
Could you check your BIOS settings wrt APM (Advanced Power Managment)?
PS, The thread started with a cold dive in water, and we forgot to say:
Hi and welcome to the forum 
Please see: How to provide good information
Although we got most info already, we still have no idea about what brand and model your laptop is, which might be related 