Sannes Brain is sleepy in Daylight

SannesBrain.cs

using System;
using System.Threading;

namespace SannesBrain
{
    public class Brain
    {
        public static void Main(string[] args)
        {
            EnvironmentVariables.DaylightChanged += (sender, eventArgs) => 
                Console.WriteLine(!EnvironmentVariables.Daylight
                                    ? "Weee!! Awake! What to do?"
                                    : "Sleepy... zzz...");

            ThreadPool.QueueUserWorkItem(e =>
                                             {
                                                 while(true)
                                                 {
                                                     var timeNow = DateTime.Now.TimeOfDay;
                                                     TimeSpan sleep;
                                                     if (timeNow < new TimeSpan(4, 41, 0) || timeNow > new TimeSpan(21, 56, 0))
                                                     {
                                                         EnvironmentVariables.Daylight = false;
                                                         sleep = new TimeSpan(4, 41, 0) - timeNow;
                                                     }
                                                     else
                                                     {
                                                         EnvironmentVariables.Daylight = true;
                                                         sleep = new TimeSpan(21, 56, 0) - timeNow;
                                                     }
                                                     Thread.Sleep(sleep);
                                                 }
                                             });
            Console.ReadKey();
        }
    }

    public delegate void EnvironmentChangedEvent(object sender, EventArgs e);

    public static class EnvironmentVariables
    {
        private static bool _daylight;
        public static bool Daylight
        {
            get { return _daylight; } 
            set
            {
                if (_daylight == value) return;

                _daylight = value;
                if (null != DaylightChanged)
                    DaylightChanged(null, EventArgs.Empty);
            }
        }
        public static event EnvironmentChangedEvent DaylightChanged;
    }
}