What condition is characterized by infrequent generalized seizures primarily occurring in the morning?

Janz syndrome, also known as juvenile myoclonic epilepsy, is characterized by the presence of myoclonic jerks, generalized tonic-clonic seizures, and absence seizures. One of the notable features of Janz syndrome is that the generalized seizures, particularly tonic-clonic seizures, tend to occur more frequently in the morning, often after awakening. This distinctive timing, coupled with the characteristic myoclonic jerks that can occur upon waking, aligns well with the description provided in the question.

In contrast, tonic-clonic epilepsy encompasses a broader range of conditions that can lead to generalized seizures but does not specifically highlight the occurrence in the morning. Absence seizures are characterized by brief episodes of loss of consciousness without generalized tonic-clonic activity and are not typically associated with the time of day. Myoclonic seizures present as sudden muscle jerks but are distinct from the generalized tonic-clonic seizures that characterize Janz syndrome and do not necessarily have a specific time of occurrence like morning.