Loss of hours while driving to Yuma, Az

Time and date are not specific, as it was when I was about 18. i am now 30. A friend and I were driving, I was the passenger, to Yuma, Az. At about 2:00 a.m., I estimate we were about 15 minutes from Yuma. We saw in the desert about half a mile away a UFO with changing colored lights, the changed so frequently, maybe going around the craft, I cant be specific of all the colors. We pulled over to watch it for about 3-5 minutes and started to take off and we were watching it as we drove off very scared trying not to panic.  The next thing i recall is we are driving in the exact same place, but it is now about 8-9 a.m. I know we were in the same place because city lights were visable at night as the same in a.m. I remember being in a very calm state and not even talking about what we had seen, just very calm and relaxed. I cannot account for the hours in between.  I have no recall of any events of being abducted, but have no explaination for the loss of hours.
Date is approximate.  PD