MIssing time with Triangular craft

I was returning to my mother's house late from visiting with friends. My two teenage children were at home with her, so I was alone in the car. 
Coming down Parker Street, which is a suburban area, I started going past part of the golf course on the left.  There are many trees here and the night was dark although there are streetlamps.  I was compelled to slow down the car (windows were open) and look over to the left as I pulled over to the curb.  There were no other cars on the road, which is strange for even this late hour as Parker Street is a main four-lane throughway.  I know the radio was on, but cannot recall any music playing just before, during or after the incident.  
I realized that hovering directly over the treetops (maybe 40' at the most as they are predominantly maples) was an immense black triangle. No lights, but it blocked all stars and ambient lighting from the surrounding area so that it was like dense black velvet. It was silent.  
As soon as I recognized it as a UFO, I recall nothing else until I was pulling away from the curb and driving on my way home.  I had a hard time understanding why I had been pulled over in the first place and struggled to recall.  
A few moments later it came back to me what I had seen.  Then I heard the music playing, looked at the car clock realizing I was missing 18 minutes of time.  I cannot recall the exact timing but I do recall the 18 minutes as the number 18 is a lifelong pattern of synchronicity. I had to laugh at that one!  
I told my mom when I got back to the house about what had happened. Her reaction was, "It doesn't surprise me!" (UFO's are a "known" 4-generation experience for us!)
Date in 1994 is approximate.  We have assigned an artificial date above.  We have requested that the witness attempt to try to recall the exact date.  PD