~ Relax before hitting the bed.
~ Reduce fluid intake before sleeping.
~ Eat at least 3 hours before sleeping.
The experiment included a group of people who were made to sleep in a different place. Using a combination of MRI (magnetic resonance imaging) and polysomnography, their brain activity was recorded. This included recording blood oxygen rate, heart rate, brain waves, eye movements, etc.
It was discovered that, the left hemisphere of the brain was more wakeful than the right part of the brain. This is because the brain functioned as a protective barrier in reaction to the body being subject to a foreign sleeping atmosphere, so as to warn the person of any danger.
While this was purely experimental, it does have a solid base. This may explain why some people are unable to sleep well in hotels or foreign locations, even with all the comforts provided.