If you have a lovebird who has become rather grumpy and irritable lately, the first thing to consider is how much like people in that if they are sleep deprived over a period of time, it will affect their mood and behavior. If your lovebird is in a part of the house that is lit late at night, it may not get enough shut-eye to fulfill its biological need for sleep. Remember that parrots in the wild roost for the night when the sun goes down and do not start becoming active until first sunrise. In many geographic areas, this can mean 12 hous of darkness or more. If you can mimic the natural light cycles of the environment, your lovebird will be happier and healthier. A dark, bird-safe cover may help you make sure your lovebird gets enough dark sleep time. Another solution can be to move the bird into a dark room in the evening away from a room with bright lights or a blaring television set.