Of Japan's population of roughly 127 million, about 118 million of them live in urban/suburban areas.
Hosei University, where this researcher is from, is in Tokyo.
So in absolute terms the statement that "The majority of Japanese people sleep in beds" is certainly correct. In context of the article, where it is being claimed that sleeping on a futon on top of a tatami mat is preparation for sleeping on the floor (and really, it isn't, but we'll ignore that), it is also valid. The majority of the Japanese populace in Japan sleeps on beds, and this researcher likely does as well.
From anecdotal experience, most modern homes I have been in in Japan have only one, if any, tatami rooms. They are not used as bedrooms, except perhaps in the 'family having a sleepover in the tatami room' sort of fashion. Modern apartments seem to have none.
Hosei University, where this researcher is from, is in Tokyo.
So in absolute terms the statement that "The majority of Japanese people sleep in beds" is certainly correct. In context of the article, where it is being claimed that sleeping on a futon on top of a tatami mat is preparation for sleeping on the floor (and really, it isn't, but we'll ignore that), it is also valid. The majority of the Japanese populace in Japan sleeps on beds, and this researcher likely does as well.
From anecdotal experience, most modern homes I have been in in Japan have only one, if any, tatami rooms. They are not used as bedrooms, except perhaps in the 'family having a sleepover in the tatami room' sort of fashion. Modern apartments seem to have none.