Sleep mode with external monitor

I've noticed that if I'm using my Macbook connected to an external monitor then sleep mode cannot be initiated by simply closing the lid.
The system starts to enter sleep then bounces out of that mode and remains running (with the dock having moved to the external screen)
Initiating sleep thru' the on/off button seems to work.
Isn't this what Beta versions are for?

Hi Ruby326,
Welcome to the Apple Support Communities!
This does sound like a very frustrating situation. I understand that your keyboard and trackpad not responsive after waking from sleep and you are forced to shut down to get them to respond. In this situation I would recommend resetting the computer’s PRAM and testing fresh. Please read over and follow the instructions for this process in the attached article.
OS X Yosemite: Reset your computer’s PRAM
Have a great day,
Joe

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