When an armor stand rests in a bed, it remains in a standing position unlike mobs and players. However, it still maintains the smaller hitbox for sleeping due to issues MC-10919 and MC-148559.

Reproduction steps

1. Position a bed with its foot at coordinates 0 -60 18

2. /summon minecraft:armor_stand ~ ~ ~ {SleepingX:-1,SleepingY:-60,SleepingZ:18}

   (You have the flexibility to modify the command coordinates if you've positioned the bed elsewhere.)

1. Press F3+B

Observed: The armor stand is not lying on the bed but still has a smaller hitbox.
Expected: The armor stand would be lying on the bed just like mobs and players.