Nolan and bella were standing in the middle of the kitchen discussing vacation plans when nolan suddenly crashed to the floor in a deep rem sleep. nolan's behavior indicates that he is suffering from

If a person falls asleep while talking, riding a bike, standing or while doing physical activities, it should not be taken casually. It is a sign of a severe sleep disorder.
Narcolepsy is a neurological condition where the brain's ability to control the sleep-wake cycle is disrupted. In such case the patient can fall into Rem sleep after falling asleep for 90 minutes.
Nolan's behavior indicates that he is suffering from Narcolepsy and must consult a sleep clinic.

The answer is overmatching