I'm sorry that your question wasn't answered in a timely manner. Complex partial seizures (also called psychomotor seizures) are most likely particularly because these dogs are closely related genetically. Sleep is the most common post-ictal (post-seizure) symptom. Mark your calendar for these events and for just what you witnessed. Their vet will need all the information you can gather when deciding if your dogs should be prescribed an anticonvulsive drug. Most of us will accept one mild (lasting less than 5 minutes, no thrashing about, no loss of consciousness) event monthly before prescribing such a drug. Should they suffer another event within 24 hours of a prior one - this appears to be the case - clustering is diagnosed and that may presage status epilepticus - the state in which seizure activity doesn't abate unless I heavily sedate or anesthetize my patient. They would then need the attention of a vet at your earliest convenience.
Here’s a quick synopsis of the type of seizures I see:
Partial seizures (previously called petit mal): focal or asymmetric sensory or motor activity affecting any part of the body (e.g., facial twitching, chomping of the mouth); can be associated with autonomic signs (salivation, vomiting, defecation).
Simple partial seizures don’t alter consciousness. Complex partial seizures cause the same symptoms as simple partial seizures and also alter mentation (mental status) and/or cause behavioral abnormalities.
Generalized seizures (previously called grand mal) cause diffuse motor activity with loss of consciousness.
Seizures first arising between the ages of 1-5 years are usually considered idiopathic (unknown cause) epilepsy. Seizures arising after 6 years of age are often caused by brain tumor or, less commonly, adult onset epilepsy. Please respond with further questions or concerns if you wish.