Droid makes calls to last number dialed

I don't know if this has been addressed. I wasn't sure how to phrase it in the search.
Anyway, I got a call from work regarding being closed for weather. Anyway, it was very early this morning. Of course I have my phone plugged in charging overnight so it was still plugged in when I answered it.
When I went to put it down I hear a faint ringing sound but the face is blank so I don't know who it is calling. Finially I get it to where the screen comes on so I can hit end. It was calling a friend of mine. I must have hit thier number with my thumb/finger while laying my phone down. This has happened a few times through the months I've had it but it was so early this morning that I feel really bad.
So my question is any suggestions on how to turn the phone off once you are done with the last call (when it's plugged in)? I know when it isn't plugged in it goes to the lock screen. Any way to get it to do that when it's plugged in?
Thanks for your help.
Nancy

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hrm, you could just manually press the power/lock button

I have the same problem the droid is so darn sensitive that it's actually ridiculous , for instance when i am on the phone with someone my chin actually hits the keys and i would not usually know this but i have the option for when i dial a number the chimes sounds so i hear the sound of keys being pressed