The end of a night's observing is always weird. You normally feel pretty tired, and after you've packed up in the control room you're ready to crash. But then you walk outside and it's a bright sunny day, and suddenly you're not tired at all any more. It was pretty disorientating to then go back to the residencia, pull down the light-tight shutters and try to go to sleep.
After our second night's observing, I decided to go up to the very top of the mountain to appreciate the views. The Kalima was blowing hard, and dust and gravel were whipping about. In the distance I could see Tenerife, poking up out of the sea of clouds that covered everything. I was the only person on the mountain top.