Mac Autocad 2016, fully updated.  

Fresh start-up of the mac and Autocad will open and run fine.

I usually leave my mac on overnight with autocad running.  My mac sleeps after a given time.  

Return the next day and autocad is unresponsive.  Autocad shows as running in the doc but will not appear on the screen.

If I quit Autocad, let the mac sleep overnight, then return the next day....  Autocad will not start but will show the little dot under the program in the doc.

If I force quit autocad it will not start again.

This happens 75% of the time I leave my mac on overnight.

I have to shut down my mac each day in order to rely on autocad opening when I need it to work the next day.

This only happens with autocad, no other programs.

Thanks in advance!