Hotel beds are limited in Tibet and reservations have to be made well in advance. Because of the high altitude of the region, travelers may experience symptoms of acute mountain sickness. One may experience sleeping difficulties, headaches and dizziness until ones body got accustomed to the conditions. The climate is dry and on the cool side even in summer. The best time to visit is from May to September.
Winters bring intense cold and fierce winds.
Other passport holders should inquire with PRC embassies or consulates. There is a short winter from January to March with moderate temperatures. Autumn and Spring are good times to visit. Persons on special medications should bring sufficient supplies for the duration of the trip, since special prescriptions may not be available in China. To bring along an anti-diarrhea formula is always a good idea.