A lot of the stuff that drives us crazy is developmentally normal behavior. The condition can be caused by a sudden shift in routine for example a new baby in the house unexpected noises such as a party at your neighbor s house or a partner s snoring bathroom trips or racing thoughts. Understanding Circadian Rhythm Sleep Disorders With Images You know lack of sleep can make you grumpy and foggy. Reasons for disturbed sleep . Sleep loss may exacerbate or induce manic symptoms or temporarily alleviate depression. Causes of disturbed sleep pattern that are rare the offical us government definition of a rare disease is one that affects 200 000 people or less. Disturbed sleep is a prominent feature of bipolar disorder also known as manic depressive illness. Are you struggling with infant sleep problems. Knowledge of what causes sleep disturbance is essential since it s helping one know when to source for help before their health is endangered. Disturbed sleep can have many adve...