Sometimes you are just too tired to play with your pets and give them the attention they need. When this kind of situation happens, you are mostly busy and tired. Good night sleep would do the trick BUT your pet decides that sleep is for weak and keep you awake the whole night just because they are too pumped up to rest because of no play in day time. Read more from the project page. --->http://www.instructables.com/id/Cat-Laser-Entertainer-Robot/