Why does the skin feel so dry after sleeping in a hotel all night?

Two reasons 1, air conditioning, air conditioning wind raised the indoor temperature, and at the same time the water was evaporated. 2, linen, all hotel linen is washed with fluorescent agent and high foam cleaning agent, which has a drying effect on the human body. Therefore, when staying in a hotel, you should prepare some boiled water to drink before going to bed and after waking up, which is good for your health.