DawnAudioNotification.cs

using UnityEngine;
using System.Collections;

[RequireComponent(typeof(AudioSource))]
public class DawnAudioNotification : MonoBehaviour
{
    private AudioSource m_audioClip;

    private void Awake()
    {
        m_audioClip = GetComponent<AudioSource>();
    }

    private void OnEnable()
    {
        Pigeons.Subscribe<Messages.OnDayNightChange>(OnDayNightStateChange);
    }

    private void OnDisable()
    {
        Pigeons.Unsubscribe<Messages.OnDayNightChange>(OnDayNightStateChange);
    }

    private void OnDayNightStateChange(Messages.OnDayNightChange message)
    {
        if(message.State == DayNightTimeState.Dawn)
            m_audioClip.Play(); 
    }
}