MBP goes sleep mode when ext. monitor turns off

Hi, sorry I couldn't find the exact answer, so I opened up a new topic. My MBP is connected to an external monitor with HDMI and I am using MBP with lid closed. But when I turn off the monitor, MBP goes to sleep mode. Can I prevent this? I need to let MBP work while external monitor is turned off. I tried Insomnia software but couldn't make it.
Thanks.

I have exactly this issue. I closed the lid last night and woke this morning to a very hot machine. It had not entered sleep mode.
When you close the lid, my Macbook enters sleep mode for a few seconds, then the external monitor wakes up.
If you 'force' sleep by on/off button it seems OK. Help!
PS: Should have said all this happened after upgrade to Lion yesterday.

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