This notebook refuses to sleep.

If I close the lid, 90% of the times, it does not enter 'sleep': since the geniuses who designed the laptop did not add any visual clue, when I put it in my bag, it reaches temperatures close to the Earth core.

Since closing the lid does not work, I command it to sleep (start -> power off -> sleep). Guess what? 90% of the times, not even this explicit command has effect. Instead of sleeping, the fans start spinning fast.

Is there any way I can put this notebook to sleep? What should I check? This issue has always been present, if not for some months, possibly thank to a system update that was actually correct.

Thanks

PS. By the way, is there any change you can enlarge the text areas of the "Private Message" section? As you can see in the screenshot below, there are quite a lot of scrollbars in an otherwise empty window.