In Season One and part of Season Two, they slept in twin beds that were pushed together. Around the time Lucy announced she was expecting a baby on the show, they started sleeping in twin beds that were separate with a lamp between them. Censorship for Tv in the 1950s was strict. Lucy couldn't even say the word pregnant on Tv. I guess they thought it was not appropriate for them to sleep with the twin beds pushed together when she got pregnant for some reason even though they were a married couple.