What is “Advanced sleep phase syndrome”?
Ans.Advanced sleep phase syndrome (ASPS) is characterized by habitual and involuntary sleep and wake times that are at least several hours earlier than normal. In such cases sleep itself is normal but the individuals often complain of persistent and irresistible sleepiness in the late afternoon or towards early evening. They may complain of involuntary early morning awakening (2 to 5 AM), which occurs even if the sleep onset is voluntarily delayed. In such cases diagnosis of depression can erroneously be made.
