diff --git a/src/game.rs b/src/game.rs
index 9fe035b..3fea8fa 100644
--- a/src/game.rs
+++ b/src/game.rs
@@ -2130,7 +2130,7 @@ impl Game {
                 if e.timer <= 0.0 {
                     let cur = e.tile();
                     let bed_kind = if flies(e.kind) { Kind::Aerie } else { Kind::Lair };
-                    let free = |i: usize| self.map.t[i].kind == bed_kind && self.map.t[i].bed == 0;
+                    let free = |i: usize| self.map.t[i].kind == bed_kind && self.map.t[i].bed == 0 && self.map.t[i].owner == self.me;
                     let found = if flies(e.kind) { self.map.search(cur, self.map.fly_cost(), free, true) } else { self.map.search(cur, self.map.walk_cost(), free, true) };
                     match found {
                         Some(p) => {
@@ -3405,7 +3405,7 @@ impl Game {
         let me = self.me;
         let target = e
             .bed
-            .filter(|&b| self.map.t[b].kind == bed_kind)
+            .filter(|&b| self.map.t[b].kind == bed_kind && self.map.t[b].owner == me)
             .or_else(|| self.map.search(cur, self.map.creature_cost(fly), |i| self.map.t[i].kind == bed_kind && self.map.t[i].owner == me, true).map(|p| p.last().copied().unwrap_or(cur)))
             .or_else(|| self.map.search(cur, self.map.creature_cost(fly), |i| self.map.adj_core_of(i, me), true).map(|p| p.last().copied().unwrap_or(cur)));
         let Some(b) = target else { return false };
@@ -3824,7 +3824,7 @@ impl Game {
             let beds = if flies(e.kind) { self.counts[7] } else { self.counts[1] };
             if e.bed.is_none() && beds > 0 && !matches!(e.job, Job::Attack(_) | Job::Leave | Job::Rally | Job::March(_)) && self.rng.f() < 0.15 {
                 let cur = e.tile();
-                let free = |i: usize| self.map.t[i].kind == bed_kind && self.map.t[i].bed == 0;
+                let free = |i: usize| self.map.t[i].kind == bed_kind && self.map.t[i].bed == 0 && self.map.t[i].owner == self.me;
                 let found = if flies(e.kind) { self.map.search(cur, self.map.fly_cost(), free, true) } else { self.map.search(cur, self.map.walk_cost(), free, true) };
                 if let Some(p) = found {
                     let b = p.last().copied().unwrap_or(cur);
@@ -4272,14 +4272,18 @@ impl Game {
             let bed_kind = if flies(e.kind) { Kind::Aerie } else { Kind::Lair };
             if let Some(b) = e.bed {
                 let t = &self.map.t[b];
-                if t.kind != bed_kind || t.bed != me {
+                // a bed in somebody else's lair (an ally's, or ground that changed hands) is given up
+                if t.kind != bed_kind || t.bed != me || t.owner != self.me {
+                    if t.bed == me {
+                        self.map.t[b].bed = 0;
+                    }
                     e.bed = None;
                 }
             }
             if e.bed.is_none() {
                 let free = |i: usize| {
                     let t = &self.map.t[i];
-                    t.kind == bed_kind && t.bed == 0
+                    t.kind == bed_kind && t.bed == 0 && t.owner == self.me
                 };
                 let found = if flies(e.kind) { self.map.search(cur, self.map.fly_cost(), free, true) } else { self.map.search(cur, self.map.walk_cost(), free, true) };
                 if let Some(p) = found {
@@ -6857,6 +6861,33 @@ mod tests {
         assert!(g.ents.iter().filter(|e| e.kind == EK::Chainbreaker).count() <= 1);
     }
 
+    #[test]
+    fn creatures_never_make_their_bed_in_an_allys_lair() {
+        let mut g = Game::new(11, 96, 128);
+        g.coop = true;
+        assert!(g.start_masters(&[0, 2], 0));
+        let (cx, cy) = g.map.core;
+        for y in cy + 4..cy + 7 {
+            for x in cx - 1..cx + 4 {
+                let t = &mut g.map.t[idx(x, y)];
+                t.kind = Kind::Lair;
+                t.owner = Owner::Player;
+            }
+        }
+        g.recount();
+        let id = g.spawn(EK::Kobold, false, cx as f32 + 1.5, cy as f32 + 5.5, 1);
+        if let Some(e) = g.ents.iter_mut().find(|e| e.id == id) {
+            e.side = 2;
+            e.energy = 0.1;
+        }
+        for _ in 0..(40 * 20) {
+            g.update(0.05);
+        }
+        let e = g.ents.iter().find(|e| e.id == id).expect("still there");
+        assert!(e.bed.map_or(true, |b| g.map.t[b].owner != Owner::Player), "no bed in the ally's lair");
+        assert!(!g.map.t.iter().any(|t| t.kind == Kind::Lair && t.bed == id + 1));
+    }
+
     #[test]
     fn every_master_of_a_coop_mission_has_an_own_portal() {
         let m = crate::campaign::coop_mission_indexes()[2];