For the last 4 years or so, whenever I need to wake up early for a trip I oversleep! Turn off the alarm unconsciously, don't even turn it on, or completely ignore it. Maybe it's because of the excitement that doesn't let me fall asleep early...
A dear friend of mine who lives in Budapest sent me a message couple weeks before the trip saying she'll be close and we should meet up. At first I though she'll be passing through Zagreb or somewhere else in Croatia, but no, she was going to Ljubljana for the weekend. "Can I join you?" I asked her and her answer was positive. So now she wasn't planing the trip on her own but we were going together. She searched for some places we should see but we didn't prepare much, we even booked the hostel after midnight on the day of the travel and found a host on couchsurfing around the same time.