Yerushalmi Sukkah 1:4 ירושלמי סוכה א׳:ד׳

MISHNAH: If he spread a sheet over it because of the sun, or under it because of fallen leaves¹³³Nothing which may become impure can be used as material for thatching the roof, Mishnah 1:12. Therefore a textile sheet spread either on top or below the thatched roof disqualifies., or if he spread it over the posts of a four-post bed¹³⁴Greek κωνωπεών, τό, Latin conopium, a bed with mosquito curtains. The ceiling of a four-post bed is horizontal; it creates a ceiling below the roof and disqualifies all space below it., it is disqualified. But one may spread it over single posts¹³⁵Greek ’ανάκλιτα “things to lean on”. Poles in the middle of headboard and foot-end of the bed with a rod connecting them. The mosquito net spread over them forms on both sides a slanting roof which is disregarded since for the majority a slanting roof is not qualified for the sukkah, Mishnah 1:12. of the bed.

HALAKHAH: It was stated: if he hung there quilts¹³⁶Sheets sewn together from rectangular pieces of cloth. it is qualified. Rebbi Ḥanina said, that you are saying on the sides¹³⁷Decorating the walls, not under the roofing. Babli 10b., but on top it is disqualified.

“Or under it because of fallen leaves.” Rebbi Yose said, they only said, “because of fallen leaves.” Therefore if not because of fallen leaves it is qualified¹³⁸For decoration, not utility. He disagrees with R. Ḥanina. Explained otherwise Babli 10a..

“But one may spread it over single posts of the bed.” Rebbi Bevai in the name of Rebbi Joḥanan: Since so he makes space with the extremities of his hands¹³⁹Since when he sleeps in the sukkah he may lift the sheet, or the mosquito net, with his fingers, it is not different from the net hanging down in an incline..