Restrict the bed usage to only one child per bed

Assets/Prefabs/Bed.prefab.meta

@@ -0,0 +1,8 @@
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+guid: 9f2c38d0d3154bc4d8148a949b98af28
+timeCreated: 1440250095
+licenseType: Free
+NativeFormatImporter:
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Assets/Scripts/Bed.cs

@@ -0,0 +1,22 @@
+using UnityEngine;
+using System.Collections;
+
+public class Bed : MonoBehaviour
+{
+    private bool _isTaken;
+
+    public bool IsTaken
+    {
+        get { return _isTaken; }
+    }
+
+    public void Take()
+    {
+        _isTaken = true;
+    }
+
+    public void Leave()
+    {
+        _isTaken = false;
+    }
+}

Assets/Scripts/Bed.cs.meta

@@ -0,0 +1,12 @@
+fileFormatVersion: 2
+guid: 49fab454291c16d4185f7f6a511de185
+timeCreated: 1440250042
+licenseType: Free
+MonoImporter:
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
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Assets/Scripts/Child.cs

@@ -6,6 +6,7 @@ public class Child : MonoBehaviour
 {
     public float Speed = 10f;
     public float JumpForce = 10f;
+    public float MaxInvulnerableTime = 2f;
     public GameObject GroundCheck;
     public Pillow pillow;
     public MomBehavior Mom;
@@ -15,6 +16,8 @@ public class Child : MonoBehaviour
     private float _xValue;
     private float _zValue;
     private bool _isSleeping;
+    private float _invulnerableTime;
+    private Bed _currentBed;
     public Transform target;
 
     private int _index;
@@ -108,11 +111,15 @@ public class Child : MonoBehaviour
 
     public bool Sleep()
     {
-        _isSleeping = IsOnBed();
+        Bed bed = GetBed();
 
-        // Temporary (only for visual cue until we get the animation)
-        if (_isSleeping)
+        if (bed != null && !bed.IsTaken)
         {
+            _currentBed = bed;
+            bed.Take();
+            _isSleeping = true;
+
+            // Temporary (only for visual cue until we get the animation)
             transform.localEulerAngles = new Vector3(90f, transform.localEulerAngles.y, transform.localEulerAngles.z);
         }
 
@@ -123,23 +130,48 @@ public class Child : MonoBehaviour
     {
         _isSleeping = false;
 
+        _currentBed.Leave();
+
+        _currentBed = null;
+
         // Temporary (only for visual cue until we get the animation)
         transform.localEulerAngles = new Vector3(0f, transform.localEulerAngles.y, transform.localEulerAngles.z);
     }
 
-    private bool IsOnBed()
+    private Bed GetBed()
     {
         Collider[] colliders = Physics.OverlapSphere(GroundCheck.transform.position, 0.149f, 1 << LayerMask.NameToLayer("Bed"));
 
-        return colliders.Length > 0;
+        return colliders.Length > 0 ? colliders[0].GetComponent<Bed>() : null;
+    }
+
+    void OnCollisionEnter(Collision collision)
+    {
+        if (collision.gameObject.tag == "Lava")
+        {
+            Debug.Log("Player " + _index + " entered lava. Lose one life.");
+            TakeLavaDamage();
+        }
     }
 
     void OnCollisionStay(Collision collision)
     {
         if (collision.gameObject.tag == "Lava")
         {
-            // TODO: Lose a life (probably) and become immune for ~ 2 or 3 seconds
-            Debug.Log("Player " + _index + " is standing on lava.");
+            _invulnerableTime += Time.deltaTime;
+
+            if (_invulnerableTime >= MaxInvulnerableTime)
+            {
+                Debug.Log("Player " + _index + " is still standing on lava. Lose one life.");
+                TakeLavaDamage();
+            }
         }
     }
+
+    private void TakeLavaDamage()
+    {
+        // TODO: Lose a life (probably) and become immune for ~ 2 or 3 seconds
+
+        _invulnerableTime = 0f;
+    }
 }