Why we wake confused in hotel room

Often people are confused when they wake up in a hotel. In fact, we get strange feeling when we sleep at any place other than usual as we wake up in changed environment. The link below describes this:

http://timesofindia.indiatimes.com/life-style/spirituality/science-of-spirituality/Why-we-wake-up-confused-in-hotel-room/articleshow/10168842.cms