the pockets and unzipped legs are the result of trying on winter gear at 80F something temps!!!
i have had people suggest that a modern suit with Gortex and not just nylon would work like one of those sleeping bags with the arms.some sort of WP bootie and a bug net for your head and you could sleep in the open without the claustrophobia of a bivvy bag.
if you need to get up late at night there would also be no need to get out of a tent,just unzip.