 At this altitude, few people feel comfortable and many start to suffer symptoms of altitude sickness or acute mountain sickness (AMS).The best times for trekking are in spring (March and April) and autumn (October and November), when the visibility of the mountain is ideal and the temperature is not excessively cold.However, in autumn the competition for bed spaces in the lodges can be intense, though normally trekkers are allowed to sleep on the floor of the dining room lodge.