Villagers dissapearing

Hello! I made a house in a village and slept through every night as soon as night fell, making impossible for hostile mobs to spawn, however they just disappeared. When I found the village there were a lot of villagers, but sleeping for like 4 nights, they just disappeared. I had 2 armorers maybe like 3 farmers and others, but they have now disappeared into the air. It is now a ghost town