There are always people giving travel tips and travel tips and travel tips. Most of these I find are pretty common, obvious and mundane, for example, remember to check your passport, don't forget to bring sunblock, make sure you have your medicine with you and so on. I am not saying that these are not important. I would prefer to call these 'reminders' rather than travel tips. A 'tip' is a piece of useful advice that should be based on the experience someone had gone through.
Now, here is one lesson I learnt recently and would like to share it here.
Very often when we stay in a hotel and when we find that it is too cold, we turn off the air-con. When I was in Lijiang recently, I was staying in a reasonably good hotel there. As it was a reasonably good hotel, the air-con in the room was working reasonably well, that is to say, it was rather cold.
So, I turned off the air-con before I went to sleep. Then in the middle of the night, I found myself gasping for air, an experience I never encountered before. I thought I had fallen sick. After an extremely uncomfortable night, I realised in the morning that I had turned-off the air-con. It then dawned upon me that Lijiang is located at an altitude of 2000 m above sea-level! The oxygen level at 2000 m is thin. By turning off the air-con in my room, I had cut-off the air-flow in an already oxygen-thin environment and aggravated the oxygen deprivation level. That was why I was gasping for air.
So, the next time before you turn-off the air-con, think how high up you are first. Oh, I mean the altitude of the location you are at, not which floor you are on in the hotel.
I will share more tips as I go along.