Macbook Pro fan on while in sleep, connected to display, closed clamshell.

Hi all,
I have recently purchased an apple monitor and have a MBP I connected up in closed clamshell mode.
I would like to leave it asleep all the time (as you can't restart it without opening clamshell).
The MBP is in a draw under the monitor.
Today I put the computer to sleep (monitor went blank) and went away for 6 hours. Before I left I heard the fan working at a very low intensity but thought it would stop once the mac had cooled down. When I got back 8 hours later the fan was still going at the same very low intensity (but working nonetheless) and the Macbook was still warm. I had left the draw open so am not too concerned that is the cause. Is this normal? I was under the impression that when asleep the laptop should stop making any sound at all, and have no hard drive function in play. I'm not comfortable leaving the macbook pro asleep if the fan is needed on 24/7.
Any help would be greatly appreciated.

Im having the same issue, when its warm and my laptop is closed and defiantly in sleep mode with the front LED flashing slowly with no external monitor. Laptop is 100% defiantly asleep as everything stops at first i can hear it. after a while i come back and the fan is running, and the laptop is warm. Quite annoying. I also noticed when i unplug the power the laptop goes into a proper sleep but when connected to power with the lid closed it seems to be restless at times. I've even had the laptop replaced and the new one does exactly the same thing.

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