Warm jackets or woollens are essential after dark at high altitude. Loose cotton is still the best material when the weather is hot. Insects These are mostly more of a nuisance than a serious hazard and if you try, you can prevent yourself entirely from being bitten. Some, such as mosquitoes are, of course, carriers of potentially serious diseases, so it is sensible to avoid being bitten as much as possible. Sleep off the ground and use a mosquito net or some kind of insecticide.
Preparations containing pyrethrum or synthetic pyrethroids are safe.
Mosquito coils release insecticide as they burn slowly. They are widely available and useful out of doors. Tablets of insecticide which are placed on a heated mat, and plugged into a wall socket are probably the most effective. They fill the room with insecticidal fumes in the same way as aerosols or coils. You can also use insect repellents, most of which are effective against a wide range of pests.