Dual screen surprise

As the good Mac user I try to become I close the lid on my computer and watch it go into sleep mode each night. Yesterday when I opened the computer the screen didn't come to life and it didn't help pressing the power button, when I didn't find any other solution I pressed and hold the power button for a while and I finally heard that it turned off - Turned off? So it was in fact running before, was my surprised reaction. 

When I managed to open the screen this morning (which is a mission in itself thanks to the thin button which requires me to use my non existing nails instead of the finger to get opened) the computer screen was black again. I pressed the power button but no response from the computer so I closed the lid again, and then the diod in the button started to pulse to indicate that the computer was in stand-by. What was happening? Why would my computer come out of stand-by without giving me any indication of it? Maybe I should turn off my secondary screen which I also had connected - And there it was the login window, since I use the built-in screen as the primary everywhere else I could not have guest that the login screen should have moved to the secondary screen when I got back from stand-by. The fact that only the secondary screen was active even after I logged in got me a bit irritated. Bringing up the screen properties and pressing detect screens solved the problem but now all windows had already been moved into the secondary screen and whatever kind of order I had managed to arrange was lost.

After my first day I thought that I wouldn't have to relearn much to become a true Macer, seams like I might been mistaken.