Although it was a place to sleep, it was also used as a living room during daytime, so that 'raw silk' was pasted on the one side of kumiko lattice to let a light pass as a skylight.
寝所とは言っても、昼間は居間として使用するため、組子格子の片面に光を透かす「すずし」（生絹）を張った天井を設けて、天井の明かり取りとした。