The Mishna on our daf teaches about the case of a person who places a sheet above the skhakh – roofing – in order to protect it from the sun or underneath it to keep it from falling onto the people below. In both of those cases the sukka would become unusable.
How about a poster bed that has a sheet hanging above the sleeping person?
In such a case, the Mishna teaches that the halakha will differ depending on how the bed is set up. In the case of kinof the sheet would be a problem, but in the case of naklitin the sukka would remain kosher and the bed can be slept in.
- The case of kinof is where there is a full four-poster bed, where the sheet that is spread across the top creates the effect of a full roof, like that of an ordinary house.
- The case of naklitin is when there are just two posts that rise from the bed in the middle of the head and the foot of the bed. This creates the effect of a tent over the bed.
The Ran explains that there are three levels of bed coverings discussed in the Gemara.
- A kilah, which is a canopy over the bed that is not permanent and is not part of the structure of the bed at all, does not present any problems for someone sleeping in a sukka.
- With Naklitin, although the two posts are permanent parts of the bed, the sloped tent that they create is not considered a significant covering to negate the fact that the individual is sleeping in a sukka.
- Only the case of kinofot, which are both permanent and create the effect of a full roof, will establish a covering that is significant enough to make it seem as though the person sleeping in such a bed is not considered to be in his sukka.