You will be picked up at 3.45 am from your hotel in Yogyakarta.
After about an hour/ 1,5 hour drive (on the way you can still sleep in the car if you can) you will arrive at Borobudur. If you have arranged your ticket in advance through your driver, you can walk straight through and enjoy the sunrise, the view of the Merapi and the morning sounds from the surrounding villages. Your view is constantly changing due to the light of the rising sun.
When the sun is up, a simple breakfast will await you at the neighboring hotel. After breakfast, your admission ticket is still valid and you can visit the Borobudur again and take photos in daylight.
The Borobudur is an impressive temple full of stories and symbolism. A guide can give you more background information and answer all your questions. If you want to use a guide, book this one day in advance through your driver.