Around 30,000 people attempt Kilimanjaro each year, and roughly 70% get to see this sunrise from the peak.
One of the biggest reasons for this is acute mountain sickness (or altitude sickness. If you’re headed on any mountain or volcano trek and spending more than four hours above 2,000 m / 6,500 ft, two tips for acclimatisation are:
Firstly, go slow. Even if you feel good, slow down and enjoy the scenery. As altitude increases, atmospheric pressure decreases. As a result, less oxygen is available to the body’s tissues, so the heart and lungs need to work harder to compensate and the body needs time to adjust.
Secondly, there’s a concept called ‘climb high, sleep low’ which involves sleeping at a lower elevation than that to which you ascended during the day. A rule of thumb is that above 3,000 m (~9,800 ft), don’t increase your sleeping altitude (i.e. where you camp) by any more than 300 m (~980 ft) per day.
If you don’t have a trek coming up, then that was a waste of 30 secs but hope you dig the pic.